Rate matching and semi persistent scheduling configuration in wireless communications

ABSTRACT

Methods, systems, and devices for wireless communications are described for identifying a modulation and coding scheme (MCS) independently of a channel quality indicator (CQI) table that is configured at a user equipment (UE). A rate matching parameter may be determined based on one or more of the MCS or CQI table, which may be used for dimensioning a soft buffer that is used to store received transmissions for decoding. The MCS field may be a six-bit field and may indicate an MCS that exceeds a highest MCS associated with the CQI table. The base station may activate a semi-persistent scheduling (SPS) configuration at the UE through an activation command, and the UE may verify that SPS is activated based on information in a number of different fields of control information which may include the MCS field.

CROSS REFERENCE

The present application for patent claims the benefit of U.S.Provisional Patent Application No. 62/697,726 by RICO ALVARINO, et al.,entitled “RATE MATCHING AND SEMI PERSISTENT SCHEDULING CONFIGURATION INWIRELESS COMMUNICATIONS,” filed Jul. 13, 2018, assigned to the assigneehereof, and expressly incorporated by reference herein.

BACKGROUND

The present disclosure relates to wireless communications, and morespecifically to rate matching and semi persistent schedulingconfiguration in wireless communications.

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include fourth generation (4G) systems such asLong Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, orLTE-A Pro systems, and fifth generation (5G) systems which may bereferred to as New Radio (NR) systems. These systems may employtechnologies such as code division multiple access (CDMA), time divisionmultiple access (TDMA), frequency division multiple access (FDMA),orthogonal frequency division multiple access (OFDMA), or discreteFourier transform-spread-OFDM (DFT-S-OFDM). A wireless multiple-accesscommunications system may include a number of base stations or networkaccess nodes, each simultaneously supporting communication for multiplecommunication devices, which may be otherwise known as user equipment(UE).

In some cases, wireless communications systems may use differentmodulation schemes for wireless transmissions, such as binary phaseshift keying (BPSK), quadrature phase shift keying (QPSK), 16 quadratureamplitude modulation (QAM), or 64 QAM, for example. Higher modulationorders may be implemented when channel conditions are relatively good,while lower modulation orders may be implemented in cases where channelconditions are relatively poor. Different coding schemes may be used inconjunction with different modulation schemes to enhance the likelihoodof successful reception of transmissions. In some cases, a UE maymeasure channel conditions and provide a channel quality indication(CQI) report to a base station, which the base station may use to selecta modulation and coding scheme (MCS) for subsequent communications withthe UE. Further, in some systems, signaling that indicates a modulationorder may also be used to provide other information (e.g., certainpatterns of one or more bits in an MCS transmission may be used toconfirm an activation of a semi-persistent scheduling (SPS)configuration at the UE). Enhanced flexibility for selecting modulationorders and indicating selected modulation orders to a UE may help toenhance efficiency of a wireless communications system.

SUMMARY

The described techniques relate to improved methods, systems, devices,and apparatuses that support rate matching and semi persistentscheduling configuration in wireless communications. Various describedtechniques provide for identifying a modulation and coding scheme (MCS)independently of a channel quality indicator (CQI) table that isconfigured at a user equipment (UE). A rate matching parameter may bedetermined based on one or more of the MCS or CQI table, which may beused for dimensioning a soft buffer that is used to store receivedtransmissions for decoding. In some cases, the MCS may be indicated by abase station through an MCS field in control information that providesan index into an MCS table. In some cases, the MCS field may be asix-bit field and may indicate an MCS that exceeds a highest MCSassociated with the CQI table.

In some cases, a base station may provide a UE with a semi persistentscheduling (SPS) configuration that allocates certain semi persistentwireless resources for recurring transmissions (e.g., voice calltransmissions) without the need for signaling separate resourceallocations for each transmission. The base station may activate a SPSconfiguration at the UE through an activation command, and the UE mayverify that SPS is activated based on information in a number ofdifferent fields of control information which may include the MCS field.In cases where the MCS field is a six-bit field, the two mostsignificant bits (MSBs) of the MCS field may be set to a predeterminedvalue (e.g., both bits set to zero) to verify (in conjunction withpredetermined values of one or more other fields) SPS activation. Incases where the MCS field indicates SPS activation, a firstinterpretation may be used to decode the MCS field, and in cases whereSPS is not activated, a second interpretation may be used to decode theMCS field. In some cases, the first interpretation can signal an MCS ofup to 64QAM, and the second interpretation can signal an MCS thatexceeds 256QAM.

A method of wireless communication at a UE is described. The method mayinclude identifying a CQI table that provides one or more parametersassociated with one or more modulation orders for transmissions betweenthe UE and a base station, receiving, from the base station, controlinformation for a downlink transmission, the control informationincluding a first index value for a first entry in an MCS table, wherethe first entry in the MCS table indicates a first modulation orderindependently of the one or more modulation orders of the CQI table, anddetermining a rate matching parameter for the downlink transmissionbased on at least one of the first modulation order or the CQI table.

An apparatus for wireless communication at a UE is described. Theapparatus may include a processor, memory in electronic communicationwith the processor, and instructions stored in the memory. Theinstructions may be executable by the processor to cause the apparatusto identify a CQI table that provides one or more parameters associatedwith one or more modulation orders for transmissions between the UE anda base station, receive, from the base station, control information fora downlink transmission, the control information including a first indexvalue for a first entry in an MCS table, where the first entry in theMCS table indicates a first modulation order independently of the one ormore modulation orders of the CQI table, and determine a rate matchingparameter for the downlink transmission based on at least one of thefirst modulation order or the CQI table.

Another apparatus for wireless communication at a UE is described. Theapparatus may include means for identifying a CQI table that providesone or more parameters associated with one or more modulation orders fortransmissions between the UE and a base station, receiving, from thebase station, control information for a downlink transmission, thecontrol information including a first index value for a first entry inan MCS table, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table, and determining a rate matching parameter for thedownlink transmission based on at least one of the first modulationorder or the CQI table.

A non-transitory computer-readable medium storing code for wirelesscommunication at a UE is described. The code may include instructionsexecutable by a processor to identify a CQI table that provides one ormore parameters associated with one or more modulation orders fortransmissions between the UE and a base station, receive, from the basestation, control information for a downlink transmission, the controlinformation including a first index value for a first entry in an MCStable, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table, and determine a rate matching parameter for the downlinktransmission based on at least one of the first modulation order or theCQI table.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for discarding the controlinformation when the first modulation order exceeds a maximum modulationorder of the one or more modulation orders of the CQI table. Someexamples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for setting a power ofreceive circuitry based on the maximum modulation order of the one ormore modulation orders of the CQI table.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the determining the ratematching parameter may include operations, features, means, orinstructions for determining that the first modulation order exceeds amaximum modulation order of the one or more modulation orders of the CQItable and determining the rate matching parameter based on a highestentry in the MCS table that has a modulation order that is supported bythe UE. In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the first index value may bea six-bit index value that identifies the first entry from 64 availableentries of the MCS table. In some examples of the method, apparatuses,and non-transitory computer-readable medium described herein, the ratematching parameter may be based on a highest supported modulation ordersupported by the UE for a radio frequency band or band combination usedfor the downlink transmission.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving RRC signalingthat includes a signaled modulation order that may be different than amodulation order indicated in the first entry in the MCS table.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining a firsttransport block size (TB S) for the downlink transmission based on thefirst modulation order, comparing the first transport block size to amaximum transport block size that may be identified based on a maximummodulation order of the one or more modulation orders of the CQI table,receiving the downlink transmission when the first transport block sizemay be less than or equal to the maximum transport block size anddiscarding the control information when the first transport block sizeexceeds the maximum transport block size.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the control information maybe first control information and the downlink transmission may be afirst downlink transmission. Some examples of the method, apparatuses,and non-transitory computer-readable medium described herein may furtherinclude operations, features, means, or instructions for receiving thefirst downlink transmission based on the determined rate matchingparameter and the first modulation order, receiving, from the basestation, second control information for a second downlink transmission,the second control information including a second index value for asecond entry in the MCS table and receiving the second downlinktransmission based on the first modulation order and the determined ratematching parameter. Some examples of the method, apparatuses, andnon-transitory computer-readable medium described herein may furtherinclude operations, features, means, or instructions for transmitting,to the base station, a capability indication that indicates the UE iscapable of operating at a modulation order that exceeds the maximummodulation order indicated by the CQI table.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving, responsiveto the capability indication, a modulation order indication thatindicates that the base station will transmit one or more downlinktransmissions having a modulation order that exceeds the maximummodulation order indicated by the CQI table and processing the controlinformation based on the modulation order indication. Some examples ofthe method, apparatuses, and non-transitory computer-readable mediumdescribed herein may further include operations, features, means, orinstructions for selecting an operating power for one or more receivecomponents of the UE based on the modulation order indication.

A method of wireless communication at a base station is described. Themethod may include identifying a CQI table that provides one or moreparameters associated with one or more modulation orders fortransmissions between the base station and a UE, transmitting, to theUE, control information for a downlink transmission, the controlinformation including a first index value for a first entry in an MCStable, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table, and transmitting the downlink transmission to the UEusing the first modulation order.

An apparatus for wireless communication at a base station is described.The apparatus may include a processor, memory in electroniccommunication with the processor, and instructions stored in the memory.The instructions may be executable by the processor to cause theapparatus to identify a CQI table that provides one or more parametersassociated with one or more modulation orders for transmissions betweenthe base station and a UE, transmit, to the UE, control information fora downlink transmission, the control information including a first indexvalue for a first entry in an MCS table, where the first entry in theMCS table indicates a first modulation order independently of the one ormore modulation orders of the CQI table, and transmit the downlinktransmission to the UE using the first modulation order.

Another apparatus for wireless communication at a base station isdescribed. The apparatus may include means for identifying a CQI tablethat provides one or more parameters associated with one or moremodulation orders for transmissions between the base station and a UE,transmitting, to the UE, control information for a downlinktransmission, the control information including a first index value fora first entry in an MCS table, where the first entry in the MCS tableindicates a first modulation order independently of the one or moremodulation orders of the CQI table, and transmitting the downlinktransmission to the UE using the first modulation order.

A non-transitory computer-readable medium storing code for wirelesscommunication at a base station is described. The code may includeinstructions executable by a processor to identify a CQI table thatprovides one or more parameters associated with one or more modulationorders for transmissions between the base station and a UE, transmit, tothe UE, control information for a downlink transmission, the controlinformation including a first index value for a first entry in an MCStable, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table, and transmit the downlink transmission to the UE usingthe first modulation order.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the first index value may bea six-bit index value that identifies the first entry from 64 availableentries of the MCS table. In some examples of the method, apparatuses,and non-transitory computer-readable medium described herein, the firstmodulation order may be selected to be at or below a maximum modulationorder of the one or more modulation orders of the CQI table.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining a highestmodulation order supported by the UE for a radio frequency band or bandcombination to be used for the downlink transmission, selecting thefirst modulation order as the highest modulation order, where the firstmodulation order corresponds to or exceeds a maximum modulation order ofthe one or more modulation orders of the CQI table and transmitting thedownlink transmission using the highest modulation order supported bythe UE. Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for transmitting RRCsignaling that includes a signaled modulation order that may bedifferent than a modulation order indicated in the first entry in theMCS table.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for determining a firsttransport block size for the downlink transmission that may be less thanor equal to a maximum transport block size that may be identified basedon a maximum modulation order of the one or more modulation orders ofthe CQI table, and where the downlink transmission uses the firsttransport block size.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the control information maybe first control information and the downlink transmission may be afirst downlink transmission, and may include operations, features,means, or instructions for transmitting, to the UE, second controlinformation for a second downlink transmission, the second controlinformation including a second index value for a second entry in the MCStable and transmitting the second downlink transmission using the firstmodulation order.

Some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for receiving, from the UE,a capability indication that indicates the UE is capable of operating ata modulation order that exceeds the maximum modulation order indicatedby the CQI table. Some examples of the method, apparatuses, andnon-transitory computer-readable medium described herein may furtherinclude operations, features, means, or instructions for transmitting,responsive to the capability indication, a modulation order indicationthat indicates that the base station will transmit one or more downlinktransmissions having a modulation order that exceeds the maximummodulation order indicated by the CQI table.

A method of wireless communication at a UE is described. The method mayinclude receiving, from a base station, a SPS configuration, decodingcontrol information from the base station based on the SPSconfiguration, where the control information includes an MCS field thatis decoded according to a first interpretation when the controlinformation is for SPS communications and according to a secondinterpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM, and determining whether SPS communications are activated basedon the decoding.

An apparatus for wireless communication at a UE is described. Theapparatus may include a processor, memory in electronic communicationwith the processor, and instructions stored in the memory. Theinstructions may be executable by the processor to cause the apparatusto receive, from a base station, a SPS configuration, decode controlinformation from the base station based on the SPS configuration, wherethe control information includes an MCS field that is decoded accordingto a first interpretation when the control information is for SPScommunications and according to a second interpretation when the controlinformation is for non-SPS communications, and where the MCS fieldaccording to the second interpretation is capable of signaling amodulation order that exceeds 256QAM, and determine whether SPScommunications are activated based on the decoding.

Another apparatus for wireless communication at a UE is described. Theapparatus may include means for receiving, from a base station, a SPSconfiguration, decoding control information from the base station basedon the SPS configuration, where the control information includes an MCSfield that is decoded according to a first interpretation when thecontrol information is for SPS communications and according to a secondinterpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM, and determining whether SPS communications are activated basedon the decoding.

A non-transitory computer-readable medium storing code for wirelesscommunication at a UE is described. The code may include instructionsexecutable by a processor to receive, from a base station, a SPSconfiguration, decode control information from the base station based onthe SPS configuration, where the control information includes an MCSfield that is decoded according to a first interpretation when thecontrol information is for SPS communications and according to a secondinterpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM, and determine whether SPS communications are activated based onthe decoding.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein the MCS field may be a six-bitMCS field, and a subset of bits of the six-bit MCS field may be used forthe first interpretation. In some examples of the method, apparatuses,and non-transitory computer-readable medium described herein, the twomost significant bits of the MCS field may be set to zero for the firstinterpretation. In some examples of the method, apparatuses, andnon-transitory computer-readable medium described herein retransmissionsof information in the MCS field may be disallowed for the firstinterpretation.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the MCS field for the firstinterpretation is capable of indicating a first subset of entries of anMCS table, and the MCS field for the second interpretation is capable ofindicating the first subset of entries of the MCS table and a secondsubset of entries of the MCS table that is different than the firstsubset of entries. In some examples of the method, apparatuses, andnon-transitory computer-readable medium described herein, the secondsubset of entries include one or more entries of the MCS table thatindicate scaling parameters, one or more entries indicating a modulationorder that exceeds a 64 QAM modulation order, one or more entries forretransmissions of MCS, or any combinations thereof.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the determining whether SPScommunications is activated may include operations, features, means, orinstructions for determining that one or more fields in the controlinformation are set to predetermined values that indicate that SPScommunications are activated, the one or more fields including the MCSfield in which two most significant bits set to zero indicates SPScommunications are activated.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the control information maybe first control information that activates SPS communications. Someexamples of the method, apparatuses, and non-transitorycomputer-readable medium described herein may further includeoperations, features, means, or instructions for communicating with thebase station using SPS transmissions, decoding second controlinformation from the base station that indicates that SPS communicationsare deactivated, where the MCS field of the second control informationincludes a six-bit field in which each bit is set to one, anddiscontinuing the SPS communications.

A method of wireless communication at a base station is described. Themethod may include configuring a UE with a SPS configuration,determining to activate SPS communications with the UE according to theSPS configuration, formatting control information to activate the SPScommunications, where the control information includes an MCS field thatis formatted according to a first interpretation when the controlinformation is for SPS communications and according to a secondinterpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM, and transmitting the control information to the UE.

An apparatus for wireless communication at a base station is described.The apparatus may include a processor, memory in electroniccommunication with the processor, and instructions stored in the memory.The instructions may be executable by the processor to cause theapparatus to configure a UE with a SPS configuration, determine toactivate SPS communications with the UE according to the SPSconfiguration, format control information to activate the SPScommunications, where the control information includes an MCS field thatis formatted according to a first interpretation when the controlinformation is for SPS communications and according to a secondinterpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM, and transmit the control information to the UE.

Another apparatus for wireless communication at a base station isdescribed. The apparatus may include means for configuring a UE with aSPS configuration, determining to activate SPS communications with theUE according to the SPS configuration, formatting control information toactivate the SPS communications, where the control information includesan MCS field that is formatted according to a first interpretation whenthe control information is for SPS communications and according to asecond interpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM, and transmitting the control information to the UE.

A non-transitory computer-readable medium storing code for wirelesscommunication at a base station is described. The code may includeinstructions executable by a processor to configure a UE with a SPSconfiguration, determine to activate SPS communications with the UEaccording to the SPS configuration, format control information toactivate the SPS communications, where the control information includesan MCS field that is formatted according to a first interpretation whenthe control information is for SPS communications and according to asecond interpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM, and transmit the control information to the UE.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein the MCS field may be a six-bitMCS field, and a subset of bits of the six-bit MCS field may be used forthe first interpretation. In some examples of the method, apparatuses,and non-transitory computer-readable medium described herein, theformatting further may include operations, features, means, orinstructions for setting two most significant bits of the MCS field tozero for the first interpretation. In some examples of the method,apparatuses, and non-transitory computer-readable medium describedherein retransmitting of information in the MCS field is disallowed forthe first interpretation. In some examples of the method, apparatuses,and non-transitory computer-readable medium described herein, the MCSfield for the first interpretation may be capable of indicating a firstsubset of entries of an MCS table, and the MCS field for the secondinterpretation may be capable of indicating the first subset of entriesof the MCS table and a second subset of entries of the MCS table that isdifferent than the first subset of entries. In some examples of themethod, apparatuses, and non-transitory computer-readable mediumdescribed herein, the second subset of entries include one or moreentries of the MCS table that indicate scaling parameters, one or moreentries indicating a modulation order that exceeds a 64 QAM modulationorder, one or more entries for retransmissions of MCS, or anycombinations thereof.

In some examples of the method, apparatuses, and non-transitorycomputer-readable medium described herein, the formatting controlinformation to activate the SPS communications may include operations,features, means, or instructions for setting one or more fields in thecontrol information to predetermined values that indicate that SPS isactivated, the one or more fields including the MCS field in which twomost significant bits may be set to zero to indicate SPS communicationsis activated. Some examples of the method, apparatuses, andnon-transitory computer-readable medium described herein may furtherinclude operations, features, means, or instructions for communicatingwith the UE using SPS transmissions, determining to deactivate the SPScommunications, formatting second control information that indicatesthat SPS communications are deactivated, where the MCS field of thesecond control information includes a six-bit field in which each bit isset to one, transmitting the second control information to the UE anddiscontinuing the SPS communications.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communicationsthat supports rate matching and semi persistent scheduling configurationin wireless communications in accordance with aspects of the presentdisclosure.

FIG. 2 illustrates an example of a portion of wireless communicationssystem that supports rate matching and semi persistent schedulingconfiguration in wireless communications in accordance with aspects ofthe present disclosure.

FIG. 3 illustrates an example of an MCS table that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure.

FIG. 4 illustrates an example of a six-bit MCS field that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure.

FIG. 5 illustrates an example of a process flow that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure.

FIGS. 6 and 7 show block diagrams of devices that support rate matchingand semi persistent scheduling configuration in wireless communicationsin accordance with aspects of the present disclosure.

FIG. 8 shows a block diagram of a communications manager that supportsrate matching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure.

FIG. 9 shows a diagram of a system including a device that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure.

FIGS. 10 and 11 show block diagrams of devices that support ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure.

FIG. 12 shows a block diagram of a communications manager that supportsrate matching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure.

FIG. 13 shows a diagram of a system including a device that supportsrate matching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure.

FIGS. 14 through 23 show flowcharts illustrating methods that supportrate matching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

Various aspects of the present disclosure provide for determining one ormore channel quality indicator (CQI), modulation and coding scheme(MCS), rate matching, or semi persistent scheduling (SPS) parametersbased on a configured CQI or MCS table and an indicated MCS. In somecases, a modulation order indicated by the MCS may be independent of,and exceed a maximum modulation order associated with, the CQI table. Arate matching parameter may be determined based on one or more of theMCS or CQI table, which may be used for dimensioning a soft buffer thatis used to store received transmissions for decoding. In some cases, theMCS may be indicated by a base station through an MCS field in controlinformation that provides an index into an MCS table. In some cases, theMCS field may be a six-bit field and may indicate an MCS of up to1024QAM.

In some cases, a base station may provide a UE with a SPS configuration,and may activate the SPS configuration at the UE through an activationcommand. The UE may verify that SPS is activated based on information ina number of different fields of control information which may includethe MCS field. In cases where the MCS field is a six-bit field, the twomost significant bits (MSBs) of the MCS field may be set to apredetermined value (e.g., both bits set to zero) to verify (inconjunction with predetermined values of one or more other fields) SPSactivation. In cases where the MCS field indicates SPS activation, afirst interpretation may be used to decode the MCS field, and in caseswhere SPS is not activated, a second interpretation may be used todecode the MCS field. In some cases, the first interpretation can signalan MCS of up to 64QAM, and the second interpretation can signal an MCSthat exceeds 256QAM.

Such techniques may provide enhanced flexibility for UEs and basestations to identify a CQI table at the UE, which may have an associatedset of modulation orders, and signal an MCS that may have a differentmodulation order than associated with the CQI table.

In such cases, modulation order may be changed based on channelconditions at the UE without the need to reconfigure an establishedconnection with a different CQI table. In some cases, additionalflexibility may also be provided through an MCS table that has 64entries that are indexed by a six-bit MCS field that may be signaled bya base station. In some legacy LTE systems, a 32 entry MCS table may beemployed, and thus a 64-entry table may provide for additional optionsthat may be selected based on dynamic channel conditions of a UE, withup to 1024QAM available in some cases when the UE has suitable channelconditions.

Aspects of the disclosure are initially described in the context of awireless communications system and examples of MCS tables and MCSfields. Aspects of the disclosure are further illustrated by anddescribed with reference to apparatus diagrams, system diagrams, andflowcharts that relate to rate matching and semi persistent schedulingconfiguration in wireless communications.

FIG. 1 illustrates an example of a wireless communications system 100that supports rate matching and semi persistent scheduling configurationin wireless communications in accordance with aspects of the presentdisclosure. The wireless communications system 100 includes basestations 105, UEs 115, and a core network 130. In some examples, thewireless communications system 100 may be a Long Term Evolution (LTE)network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a NewRadio (NR) network. In some cases, wireless communications system 100may support enhanced broadband communications, ultra-reliable (e.g.,mission critical) communications, low latency communications, orcommunications with low-cost and low-complexity devices. In some cases,UEs 115 and base stations 105 may support relatively high modulationorders (e.g., modulation orders up to 1024QAM) that may be indicated viaan MCS indication that is independent of a CQI table that is configuredat a UE 115.

Base stations 105 may wirelessly communicate with UEs 115 via one ormore base station antennas. Base stations 105 described herein mayinclude or may be referred to by those skilled in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation Node B orgiga-nodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or some other suitable terminology. Wirelesscommunications system 100 may include base stations 105 of differenttypes (e.g., macro or small cell base stations). The UEs 115 describedherein may be able to communicate with various types of base stations105 and network equipment including macro eNBs, small cell eNBs, gNBs,relay base stations, and the like.

Each base station 105 may be associated with a particular geographiccoverage area 110 in which communications with various UEs 115 issupported. Each base station 105 may provide communication coverage fora respective geographic coverage area 110 via communication links 125,and communication links 125 between a base station 105 and a UE 115 mayutilize one or more carriers. Communication links 125 shown in wirelesscommunications system 100 may include uplink transmissions from a UE 115to a base station 105, or downlink transmissions from a base station 105to a UE 115. Downlink transmissions may also be called forward linktransmissions while uplink transmissions may also be called reverse linktransmissions.

The geographic coverage area 110 for a base station 105 may be dividedinto sectors making up only a portion of the geographic coverage area110, and each sector may be associated with a cell. For example, eachbase station 105 may provide communication coverage for a macro cell, asmall cell, a hot spot, or other types of cells, or various combinationsthereof. In some examples, a base station 105 may be movable andtherefore provide communication coverage for a moving geographiccoverage area 110. In some examples, different geographic coverage areas110 associated with different technologies may overlap, and overlappinggeographic coverage areas 110 associated with different technologies maybe supported by the same base station 105 or by different base stations105.

The wireless communications system 100 may include, for example, aheterogeneous LTE/LTE-A/LTE-A Pro or NR network in which different typesof base stations 105 provide coverage for various geographic coverageareas 110.

The term “cell” refers to a logical communication entity used forcommunication with a base station 105 (e.g., over a carrier), and may beassociated with an identifier for distinguishing neighboring cells(e.g., a physical cell identifier (PCID), a virtual cell identifier(VCID)) operating via the same or a different carrier. In some examples,a carrier may support multiple cells, and different cells may beconfigured according to different protocol types (e.g., machine-typecommunication (MTC), narrowband Internet-of-Things (NB-IoT), enhancedmobile broadband (eMBB), or others) that may provide access fordifferent types of devices. In some cases, the term “cell” may refer toa portion of a geographic coverage area 110 (e.g., a sector) over whichthe logical entity operates.

UEs 115 may be dispersed throughout the wireless communications system100, and each UE 115 may be stationary or mobile. A UE 115 may also bereferred to as a mobile device, a wireless device, a remote device, ahandheld device, or a subscriber device, or some other suitableterminology, where the “device” may also be referred to as a unit, astation, a terminal, or a client. A UE 115 may also be a personalelectronic device such as a cellular phone, a personal digital assistant(PDA), a tablet computer, a laptop computer, or a personal computer. Insome examples, a UE 115 may also refer to a wireless local loop (WLL)station, an Internet of Things (IoT) device, an Internet of Everything(IoE) device, or an MTC device, or the like, which may be implemented invarious articles such as appliances, vehicles, meters, or the like.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices, and may provide for automated communication betweenmachines (e.g., via Machine-to-Machine (M2M) communication). M2Mcommunication or MTC may refer to data communication technologies thatallow devices to communicate with one another or a base station 105without human intervention. In some examples, M2M communication or MTCmay include communications from devices that integrate sensors or metersto measure or capture information and relay that information to acentral server or application program that can make use of theinformation or present the information to humans interacting with theprogram or application. Some UEs 115 may be designed to collectinformation or enable automated behavior of machines. Examples ofapplications for MTC devices include smart metering, inventorymonitoring, water level monitoring, equipment monitoring, healthcaremonitoring, wildlife monitoring, weather and geological eventmonitoring, fleet management and tracking, remote security sensing,physical access control, and transaction-based business charging.

In some cases, a UE 115 may also be able to communicate directly withother UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device(D2D) protocol). One or more of a group of UEs 115 utilizing D2Dcommunications may be within the geographic coverage area 110 of a basestation 105. Other UEs 115 in such a group may be outside the geographiccoverage area 110 of a base station 105, or be otherwise unable toreceive transmissions from a base station 105. In some cases, groups ofUEs 115 communicating via D2D communications may utilize a one-to-many(1:M) system in which each UE 115 transmits to every other UE 115 in thegroup. In some cases, a base station 105 facilitates the scheduling ofresources for D2D communications. In other cases, D2D communications arecarried out between UEs 115 without the involvement of a base station105.

Base stations 105 may communicate with the core network 130 and with oneanother. For example, base stations 105 may interface with the corenetwork 130 through backhaul links 132 (e.g., via an S1, N2, N3, orother interface). Base stations 105 may communicate with one anotherover backhaul links 134 (e.g., via an X2, Xn, or other interface) eitherdirectly (e.g., directly between base stations 105) or indirectly (e.g.,via core network 130).

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC), which may include at least one mobilitymanagement entity (MME), at least one serving gateway (S-GW), and atleast one Packet Data Network (PDN) gateway (P-GW). The MME may managenon-access stratum (e.g., control plane) functions such as mobility,authentication, and bearer management for UEs 115 served by basestations 105 associated with the EPC. User IP packets may be transferredthrough the S-GW, which itself may be connected to the P-GW. The P-GWmay provide IP address allocation as well as other functions. The P-GWmay be connected to the network operators IP services. The operators IPservices may include access to the Internet, Intranet(s), an IPMultimedia Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.

At least some of the network devices, such as a base station 105, mayinclude subcomponents such as an access network entity, which may be anexample of an access node controller (ANC). Each access network entitymay communicate with UEs 115 through a number of other access networktransmission entities, which may be referred to as a radio head, a smartradio head, or a transmission/reception point (TRP). In someconfigurations, various functions of each access network entity or basestation 105 may be distributed across various network devices (e.g.,radio heads and access network controllers) or consolidated into asingle network device (e.g., a base station 105).

Wireless communications system 100 may operate using one or morefrequency bands, typically in the range of 300 MHz to 300 GHz.Generally, the region from 300 MHz to 3 GHz is known as the ultra-highfrequency (UHF) region or decimeter band, since the wavelengths rangefrom approximately one decimeter to one meter in length. UHF waves maybe blocked or redirected by buildings and environmental features.However, the waves may penetrate structures sufficiently for a macrocell to provide service to UEs 115 located indoors. Transmission of UHFwaves may be associated with smaller antennas and shorter range (e.g.,less than 100 km) compared to transmission using the smaller frequenciesand longer waves of the high frequency (HF) or very high frequency (VHF)portion of the spectrum below 300 MHz.

Wireless communications system 100 may also operate in a super highfrequency (SHF) region using frequency bands from 3 GHz to 30 GHz, alsoknown as the centimeter band. The SHF region includes bands such as the5 GHz industrial, scientific, and medical (ISM) bands, which may be usedopportunistically by devices that can tolerate interference from otherusers.

Wireless communications system 100 may also operate in an extremely highfrequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz),also known as the millimeter band. In some examples, wirelesscommunications system 100 may support millimeter wave (mmW)communications between UEs 115 and base stations 105, and EHF antennasof the respective devices may be even smaller and more closely spacedthan UHF antennas. In some cases, this may facilitate use of antennaarrays within a UE 115. However, the propagation of EHF transmissionsmay be subject to even greater atmospheric attenuation and shorter rangethan SHF or UHF transmissions. Techniques disclosed herein may beemployed across transmissions that use one or more different frequencyregions, and designated use of bands across these frequency regions maydiffer by country or regulating body.

In some cases, wireless communications system 100 may utilize bothlicensed and unlicensed radio frequency spectrum bands. For example,wireless communications system 100 may employ License Assisted Access(LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technologyin an unlicensed band such as the 5 GHz ISM band. When operating inunlicensed radio frequency spectrum bands, wireless devices such as basestations 105 and UEs 115 may employ listen-before-talk (LBT) proceduresto ensure a frequency channel is clear before transmitting data. In somecases, operations in unlicensed bands may be based on a CA configurationin conjunction with CCs operating in a licensed band (e.g., LAA).Operations in unlicensed spectrum may include downlink transmissions,uplink transmissions, peer-to-peer transmissions, or a combination ofthese. Duplexing in unlicensed spectrum may be based on frequencydivision duplexing (FDD), time division duplexing (TDD), or acombination of both.

In some examples, base station 105 or UE 115 may be equipped withmultiple antennas, which may be used to employ techniques such astransmit diversity, receive diversity, multiple-input multiple-output(MIMO) communications, or beamforming. For example, wirelesscommunications system 100 may use a transmission scheme between atransmitting device (e.g., a base station 105) and a receiving device(e.g., a UE 115), where the transmitting device is equipped withmultiple antennas and the receiving devices are equipped with one ormore antennas. MIMO communications may employ multipath signalpropagation to increase the spectral efficiency by transmitting orreceiving multiple signals via different spatial layers, which may bereferred to as spatial multiplexing. The multiple signals may, forexample, be transmitted by the transmitting device via differentantennas or different combinations of antennas. Likewise, the multiplesignals may be received by the receiving device via different antennasor different combinations of antennas. Each of the multiple signals maybe referred to as a separate spatial stream, and may carry bitsassociated with the same data stream (e.g., the same codeword) ordifferent data streams. Different spatial layers may be associated withdifferent antenna ports used for channel measurement and reporting. MIMOtechniques include single-user MIMO (SU-MIMO) where multiple spatiallayers are transmitted to the same receiving device, and multiple-userMIMO (MU-MIMO) where multiple spatial layers are transmitted to multipledevices.

Beamforming, which may also be referred to as spatial filtering,directional transmission, or directional reception, is a signalprocessing technique that may be used at a transmitting device or areceiving device (e.g., a base station 105 or a UE 115) to shape orsteer an antenna beam (e.g., a transmit beam or receive beam) along aspatial path between the transmitting device and the receiving device.Beamforming may be achieved by combining the signals communicated viaantenna elements of an antenna array such that signals propagating atparticular orientations with respect to an antenna array experienceconstructive interference while others experience destructiveinterference. The adjustment of signals communicated via the antennaelements may include a transmitting device or a receiving deviceapplying certain amplitude and phase offsets to signals carried via eachof the antenna elements associated with the device. The adjustmentsassociated with each of the antenna elements may be defined by abeamforming weight set associated with a particular orientation (e.g.,with respect to the antenna array of the transmitting device orreceiving device, or with respect to some other orientation).

In some cases, the antennas of a base station 105 or UE 115 may belocated within one or more antenna arrays, which may support MIMOoperations, or transmit or receive beamforming. For example, one or morebase station antennas or antenna arrays may be co-located at an antennaassembly, such as an antenna tower. In some cases, antennas or antennaarrays associated with a base station 105 may be located in diversegeographic locations. A base station 105 may have an antenna array witha number of rows and columns of antenna ports that the base station 105may use to support beamforming of communications with a UE 115.Likewise, a UE 115 may have one or more antenna arrays that may supportvarious MIMO or beamforming operations.

In some cases, wireless communications system 100 may be a packet-basednetwork that operate according to a layered protocol stack. In the userplane, communications at the bearer or Packet Data Convergence Protocol(PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may insome cases perform packet segmentation and reassembly to communicateover logical channels. A Medium Access Control (MAC) layer may performpriority handling and multiplexing of logical channels into transportchannels. The MAC layer may also use hybrid automatic repeat request(HARD) to provide retransmission at the MAC layer to improve linkefficiency. In the control plane, the Radio Resource Control (RRC)protocol layer may provide establishment, configuration, and maintenanceof an RRC connection between a UE 115 and a base station 105 or corenetwork 130 supporting radio bearers for user plane data. At thePhysical (PHY) layer, transport channels may be mapped to physicalchannels.

In some cases, UEs 115 and base stations 105 may support retransmissionsof data to increase the likelihood that data is received successfully.HARQ feedback is one technique of increasing the likelihood that data isreceived correctly over a communication link 125. HARQ may include acombination of error detection (e.g., using a cyclic redundancy check(CRC)), forward error correction (FEC), and retransmission (e.g.,automatic repeat request (ARQ)). HARQ may improve throughput at the MAClayer in poor radio conditions (e.g., signal-to-noise conditions). Insome cases, a wireless device may support same-slot HARQ feedback, wherethe device may provide HARQ feedback in a specific slot for datareceived in a previous symbol in the slot. In other cases, the devicemay provide HARQ feedback in a subsequent slot, or according to someother time interval.

Time intervals in LTE or NR may be expressed in multiples of a basictime unit, which may, for example, refer to a sampling period of T_(s)=1/30,720,000 seconds. Time intervals of a communications resource may beorganized according to radio frames each having a duration of 10milliseconds (ms), where the frame period may be expressed asT_(f)=307,200 T_(s). The radio frames may be identified by a systemframe number (SFN) ranging from 0 to 1023. Each frame may include 10subframes numbered from 0 to 9, and each subframe may have a duration of1 ms. A subframe may be further divided into 2 slots each having aduration of 0.5 ms, and each slot may contain 6 or 7 modulation symbolperiods (e.g., depending on the length of the cyclic prefix prepended toeach symbol period). Excluding the cyclic prefix, each symbol period maycontain 2048 sampling periods. In some cases, a subframe may be thesmallest scheduling unit of the wireless communications system 100, andmay be referred to as a transmission time interval (TTI). In othercases, a smallest scheduling unit of the wireless communications system100 may be shorter than a subframe or may be dynamically selected (e.g.,in bursts of shortened TTIs (sTTIs) or in selected component carriersusing sTTIs).

In some wireless communications systems, a slot may further be dividedinto multiple mini-slots containing one or more symbols. In someinstances, a symbol of a mini-slot or a mini-slot may be the smallestunit of scheduling. Each symbol may vary in duration depending on thesubcarrier spacing or frequency band of operation, for example. Further,some wireless communications systems may implement slot aggregation inwhich multiple slots or mini-slots are aggregated together and used forcommunication between a UE 115 and a base station 105.

The term “carrier” refers to a set of radio frequency spectrum resourceshaving a defined physical layer structure for supporting communicationsover a communication link 125. For example, a carrier of a communicationlink 125 may include a portion of a radio frequency spectrum band thatis operated according to physical layer channels for a given radioaccess technology. Each physical layer channel may carry user data,control information, or other signaling. A carrier may be associatedwith a pre-defined frequency channel (e.g., an E-UTRA absolute radiofrequency channel number (EARFCN)), and may be positioned according to achannel raster for discovery by UEs 115. Carriers may be downlink oruplink (e.g., in an FDD mode), or be configured to carry downlink anduplink communications (e.g., in a TDD mode). In some examples, signalwaveforms transmitted over a carrier may be made up of multiplesub-carriers (e.g., using multi-carrier modulation (MCM) techniques suchas OFDM or DFT-s-OFDM).

The organizational structure of the carriers may be different fordifferent radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR,etc.). For example, communications over a carrier may be organizedaccording to TTIs or slots, each of which may include user data as wellas control information or signaling to support decoding the user data. Acarrier may also include dedicated acquisition signaling (e.g.,synchronization signals or system information, etc.) and controlsignaling that coordinates operation for the carrier. In some examples(e.g., in a carrier aggregation configuration), a carrier may also haveacquisition signaling or control signaling that coordinates operationsfor other carriers.

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using time divisionmultiplexing (TDM) techniques, frequency division multiplexing (FDM)techniques, or hybrid TDM-FDM techniques. In some examples, controlinformation transmitted in a physical control channel may be distributedbetween different control regions in a cascaded manner (e.g., between acommon control region or common search space and one or more UE-specificcontrol regions or UE-specific search spaces).

A carrier may be associated with a particular bandwidth of the radiofrequency spectrum, and in some examples the carrier bandwidth may bereferred to as a “system bandwidth” of the carrier or the wirelesscommunications system 100. For example, the carrier bandwidth may be oneof a number of predetermined bandwidths for carriers of a particularradio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Insome examples, each served UE 115 may be configured for operating overportions or all of the carrier bandwidth. In other examples, some UEs115 may be configured for operation using a narrowband protocol typethat is associated with a predefined portion or range (e.g., set ofsubcarriers or RBs) within a carrier (e.g., “in-band” deployment of anarrowband protocol type).

In a system employing MCM techniques, a resource element may consist ofone symbol period (e.g., a duration of one modulation symbol) and onesubcarrier, where the symbol period and subcarrier spacing are inverselyrelated. The number of bits carried by each resource element may dependon the modulation scheme (e.g., the order of the modulation scheme).Thus, the more resource elements that a UE 115 receives and the higherthe order of the modulation scheme, the higher the data rate may be forthe UE 115. In MIMO systems, a wireless communications resource mayrefer to a combination of a radio frequency spectrum resource, a timeresource, and a spatial resource (e.g., spatial layers), and the use ofmultiple spatial layers may further increase the data rate forcommunications with a UE 115.

In some cases, a base station 105 and UE 115 may establish a connectionand, as part of the connection establishment, identify a CQI table. TheCQI table may contain a mapping between a CQI that is measured at the UE115, and a modulation order and coding rate. Following the connectionestablishment, the base station 105 may allocate resources for adownlink transmission (e.g., a physical downlink shared channel (PDSCH)transmission) and provide downlink control information (DCI) to the UEthat indicates that allocated resources and an MCS associated with thetransmission. In some cases, a modulation order indicated by the MCS maybe independent of, and exceed a maximum modulation order associatedwith, the CQI table. The UE 115 may determine a rate matching parameterbased on one or more of the MCS or CQI table, which may be used fordimensioning a soft buffer that is used to store received transmissionsfor decoding. In some cases, the MCS may be indicated by the basestation 105 through an MCS field in the DCI that provides an index intoan MCS table. In some cases, the MCS field may be a six-bit field andmay indicate an MCS of up to 1024QAM.

In some cases, a base station 105 may provide a UE 115 with a SPSconfiguration, and may activate the SPS configuration at the UE 115through an activation command. The UE 115 may verify that SPS isactivated based on values for a number of different fields of the DCI,which may include the MCS field. In cases where the MCS field is asix-bit field, the two MSBs of the MCS field may be set to apredetermined value (e.g., both bits set to zero) to verify (inconjunction with predetermined values of one or more other fields) SPSactivation. In cases where the MCS field indicates SPS activation, afirst interpretation may be used to decode the MCS field, and in caseswhere SPS is not activated, a second interpretation may be used todecode the MCS field. In some cases, the first interpretation can signalan MCS of up to 64QAM, and the second interpretation can signal an MCSthat exceeds 256QAM.

FIG. 2 illustrates an example of a portion of a wireless communicationssystem 200 that supports rate matching and semi persistent schedulingconfiguration in wireless communications in accordance with aspects ofthe present disclosure. In some examples, wireless communications system200 may implement aspects of wireless communications system 100.Wireless communications system 200 may include base station 105-a and UE115-a, which may be examples of a base station 105 and a UE 115described with reference to FIG. 1. In some examples, base station 105-amay be in communication with one or more UEs 115 within geographiccoverage area 110-a. In this example, wireless communications system 200may support a communications link 205 with relatively high modulationorders, such as 256QAM or 1024QAM, and control information 210 mayprovide a six-bit MCS field that provides an index into a 64-entry MCStable.

In some cases, as part of a connection establishment to establish thecommunication link 205, the UE 115-a may provide a CQI report and thebase station 105-a may configure a CQI table that is to be used at theUE 115-a. The CQI table may map modulation orders and coding rates to anumber (e.g., 16) of index values that are based on CQI values measuredat the UE 115-a. In some legacy LTE or NR systems, the indicated MCS inDCI is linked to the modulation orders of the CQI table, and thus thesignaled MCS and the CQI table may be used by the UE 115-a to determinea modulation order, coding rate, and a transport block size for atransmission. Further, the UE 115-a may perform rate-matching onreceived downlink transmissions and place transport blocks in asoft-buffer for decoding. The rate matching in such cases may be basedon the configured CQI table, in which the UE 115-a configures its softbuffer dimensioning in accordance with the MCS and coding rate. Forexample, in some cases UE 115-a may determine a number of bits (N_(IR))for a transport block and a soft buffer size for a particular code block(N_(cb)) based on a value (K_(C)) that is associated with a configuredCQI table (e.g., according to 3GPP TS 36.212, section 5.1.4). In somecases, N_(IR) is obtained according to:

$N_{IR} = \left\lfloor \frac{N_{soft}}{K_{C} \cdot K_{MIMO} \cdot {\min \left( {M_{DL\_ HARQ},M_{limit}} \right)}} \right\rfloor$

and the size N_(cb) is obtained according to:

$N_{cb} = {\min \left( {\left\lfloor \frac{N_{IR}}{C} \right\rfloor,K_{w}} \right)}$

where N_(soft) is the total number of soft channel bits according to theUE category; K_(MIMO) is equal to either one or two based on atransmission mode of the UE; M_(DL_HARQ) is the maximum number of DLHARQ processes; M_(limit) is a constant equal to 8; K_(w) is the totalnumber of coded bits, and C is the number of code blocks. As indicated,the value of K_(C) may be predetermined based on a CQI table that isconfigured at the UE 115-a. For example, in some cases (e.g., accordingto 3GPP TS 36.212), the value of K_(C) may be determined as follows:

-   -   if the UE is configured by higher layers with        altCQI-Table-1024QAM-r15,        -   K_(C)=8/5    -   else if the UE is configured by higher layers with        altCQI-Table-r12,        -   K_(C)=2    -   else        -   K_(C)=8/3.

However, in some deployments, the modulation order of the signaled MCSmay be independent of the CQI table, and in some cases the signaled MCSmay exceed a maximum modulation order associated with the CQI table. Insuch cases, the UE 115-a may use one or more other techniques todetermine rate matching and a soft buffer size. In some examples, whenthe UE 115-a is configured with a six-bit MCS field in the controlinformation 210, the base station 105-a may have a constraint that it isnot to schedule the UE 115-a with a modulation order that exceeds thehighest modulation order of the configured CQI table. The UE 115-a maythus expect to receive such an MCS and may discard or ignore a DCItransmission from the base station 105-a that indicates a higher MCS.For example, if the UE 115-a is configured with a 256QAM CQI table (inwhich a highest modulation order associated with the CQI table is256QAM), the UE 115-a is not expected to be scheduled with 1024QAM, andthe base station 105-a will schedule 256QAM or lower modulation orders.Similarly, if the UE 115-a is configured with a 64QAM CQI table, the UE115-a is not expected to be scheduled with 256QAM or 1024QAM. Further,in some cases the UE 115-a may set a power level of receive RF circuitrybased on the CQI table, and if a lower modulation order is configured inthe CQI table the UE 115-a may be able to reduce the power level of theRF circuitry. In such examples, the rate matching behavior at the UE115-a thus follows the configured CQI table. In some other examples, theUE 115-a may, when the MCS indicates a modulation order that exceeds thehighest modulation order of the configured CQI table, reinterpret thesignaled MCS and move to the highest MCS with supportable modulationscheme.

In some other examples, when the UE 115-a is configured with the six-bitMCS field, the rate matching behavior may be set to be the maximumsupported modulation scheme in that band in the band combination of thecarrier that is used for a transmission. For example, if the UE 115-a isconfigured with a 256QAM CQI table, but UE 115-a supports 1024QAM in thecarrier band in the band combination, then the UE 115-a performs ratematching assuming 1024QAM. In some examples that employ this technique,the value of K_(C) may be determined as follows:

-   -   if the UE is configured by higher layers with        altCQI-Table-1024QAM-r15, or if the UE is configured by higher        layers with altMCS-Table and the UE indicates support of 1024QAM        in the band of band combination        -   K_(C)=8/5    -   else if the UE is configured by higher layers with        altCQI-Table-r12, or if the UE is configured by higher layers        with altMCS-Table and the UE indicates support of 256QAM (in the        band of band combination)        -   K_(C)=2    -   else        -   K_(C)=8/3.

In some further examples, the base station 105-a may explicitly signalthe reference modulation scheme to use for the rate matching (e.g. via aseparate parameter that is configured per component carrier). Such casesmay allow the base station 105-a to implement a six-bit MCS field, butnot 1024QAM (e.g. not understanding the capability for 1024QAM), forexample. In some examples that employ this technique, the value of K_(C)may be determined as follows:

-   -   if the UE is configured by higher layers with        altCQI-Table-1024QAM-r15, or if the UE is configured by higher        layers with altMCS-Table and        altMCS-Table-referenceModulation=1024QAM        -   K_(C)=8/5    -   else if the UE is configured by higher layers with        altCQI-Table-r12, or if the UE is configured by higher layers        with altMCS-Table and altMCS-Table-referenceModulation=256QAM        -   K_(C)=2    -   else        -   K_(C)=8/3.

In still further examples, the base station 105-a may provide aconstraint on the maximum scheduled transport block size, instead ofmodulation scheme. Such a technique recognizes that for small transportblock size values, the rate matching behavior is the same regardless ofmodulation scheme (i.e., due to minimum operator employed in determiningNib as discussed above). In such examples, maximum transport block sizesmay be identified as follows:

-   -   Maximum transport block size for 64-QAM: 75376;    -   Maximum transport block size for 256-QAM: 100752;    -   Maximum transport block size for 1024-QAM: 125808.        Thus, for a transport block size mapped to single layer, if the        UE 115-a is configured with CQI table for 64QAM, the UE may not        be expected to receive transport block size of greater than        75376, and if the UE 115-a is configured with CQI table for        256QAM, the UE 115-a is not expected to receive transport block        size of greater than 100752. In cases where transport block size        is mapped to multiple layers, similar maximum transport block        sizes may be identified.

In further examples, the UE 115-a may perform rate matching by followingthe signaled MCS and modulation scheme for the first transmission fromthe base station 105-a following configuration with a particular CQItable. In some examples that employ this technique, the value of K_(C)may be determined as follows:

-   -   if the UE is configured by higher layers with        altCQI-Table-1024QAM-r15, or if the UE is configured by higher        layers with altMCS-Table and the first transmission of the        transport block size is using 1024QAM        -   K_(C)=8/5    -   else if the UE is configured by higher layers with        altCQI-Table-r12, or if the UE is configured by higher layers        with altMCS-Table and the first transmission of the transport        block size is using 256QAM        -   K_(C)=2    -   else        -   K_(C)=8/3.

Thus, the base station 105-a and UE 115-a may use such techniques whenconfigured with a six-bit MCS field to determine rate matchingparameters for transmissions. Additionally, in some cases the UE 115-amay have the capability to adjust RF power settings. For example, the UE115-a may have the capability to put its RF front end in a “lowfidelity” mode for power savings, which may reduce the maximummodulation scheme that the UE 115-a can support. In some cases, the UE115-a may select such a “low fidelity mode” for operation (e.g., basedon prior transmissions of the base station 105-a, power consumption,available battery power, thermal limits, one or more other parameters,or combinations thereof), and the UE 115-a may fail decoding if a grantis received with a higher modulation order than expected. In cases wherethe UE selects a “high fidelity mode” for operation, it may receivehigher modulation order transmissions, but may burn unnecessary power inthe event that the base station 105-a does not schedule highermodulation order transmissions. In some cases, the UE 115-a may transmita capability indication to the base station 105-a that indicates whetherthe UE 115-a expects to receive higher modulation order transmissions.In some cases, the capability indication may indicate whether the UE115-a supports receiving higher modulation order than in the configuredCQI table. In some cases, responsive to the capability indication, thebase station 105-a may provide a configuration to the UE 115-a thatindicates whether to monitor for and/or expect higher modulation orderthan in the configured CQI table.

FIG. 3 illustrates an example of an MCS table 300 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Insome examples, MCS table 300 may be implemented in aspects of wirelesscommunications system 100 or 200. As discussed above, in some cases asix-bit MCS field may be used to indicate an MCS to a UE, in which thevalue of the six-bit field corresponds to an MCS index 305 into a64-entry MCS table 300. The MCS table 300 may include a column for afirst modulation order Q. 310, a column for a second modulation order Q315 for use by UEs that are scheduled in a single slot of a subframe, atransport block size index 320 column, and a scaling 325 column.

In this example, rows 335 correspond to entries where scaling is “yes,”which indicate that a scaling value is applied to account for overhead.In some examples, for the entries with “scaling=No,” the UE followslegacy procedure to determine the transport block size, and for theentries with “scaling=Yes” (i.e., entries in rows 335-a and 335-b) theUE selects the transport block size by scaling the number of allocatedPRBs by a factor α, where a is RRC configured. Entries 330 in thisexample are reserved entries for retransmissions.

FIG. 4 illustrates an example of six-bit MCS fields 400 that supportsrate matching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Insome examples, six-bit MCS fields 400 may be implemented in aspects ofwireless communications system 100 or 200. In this example, six-bit MCSfield 405 may be used to indicate an index value into MCS table (e.g.,MCS table 300). In some cases, as indicated above, a UE may beconfigured with an SPS configuration, and in such cases MCS field 410may be scrambled by a different identifier that indicates that a DCI isfor SPS. For example, MCS field 405 may be scrambled by a cell radionetwork temporary identifier (C-RNTI) and MCS field 410 may be scrambledby a separate SPS C-RNTI. In this example, the two most significant bits315 of the MCS field 410 may be set to a predetermined value (e.g., 0,0) to indicate SPS is activated at the UE. In some cases, for DCIscrambled with SPS C-RNTI, and if the DCI has six-bit field for MCS, theUE may interpret the MCS field 410 as being mapped to a five-bit 64QAMMCS table (32 entries) with one or more of the following constraints: 1)the two MSBs 415 of MCS field 410 are set to zero, or 2) retransmissionMCS is disallowed (i.e., MCS between 29 and 31 of the five-bit 64QAM MCStable). In other cases, rather than having the two MSBs 415 set to zero,only a subset of entries of the MCS table may be configured for MCSfield 410. In other cases, the six-bit MCS table may be used, but withone or more of the following constraints: 1) the scaling entries are notsignaled (e.g., UE may discard the DCI if it receives such grant); 2)only up to 64-QAM entries are signaled, or 3) retransmission MCS isdisallowed (i.e., MCS between 59 and 63 of MCS table 300).

As also indicated above, SPS may be activated and deactivated at a UE bya base station. In some cases, when the UE is configured with a six-bitMCS field, SPS activation may be verified based on the values in thedifferent DCI fields as indicated in Table 1, and SPS deactivation maybe verified based on the values in the different DCI fields as indicatedin Table 2:

TABLE 1 Field values for SPS Activation DCI format DCI format DCI format0 1/1A 2/2A/2B/2C/2D TPC command set to ‘00’ N/A N/A for scheduled PUSCHCyclic shift set to ‘000’ N/A N/A DM RS if present Modulation and MSB isset N/A N/A coding scheme to ‘0’ and redundancy version HARQ process N/AFDD: set to ‘000’ FDD: set to ‘000’ number TDD: set to ‘0000’ TDD: setto ‘0000’ Modulation and N/A MSB is set to ‘0’ For the enabled codingscheme for 5-bit MCS transport block: field, otherwise two MSB is set to‘0’ MSB are set to ‘0’ for 5-bit MCS field, otherwise two MSB are set to‘0’ Redundancy N/A set to ‘00’ For the enabled version transport block:set to ‘00’

TABLE 2 Field values for SPS Release. DCI format 0 DCI format 1A TPCcommand for set to ‘00’ N/A scheduled PUSCH Cyclic shift DM RS set to‘000’ N/A if present Modulation and coding set to ‘11111’ N/A scheme andredundancy version Resource block Set to all ‘1’s N/A assignment andhopping resource allocation HARQ process number N/A FDD: set to ‘000’TDD: set to ‘0000’ Modulation and coding N/A 5-bit field: set to scheme‘11111’ 6-bit field: set to ‘111111’ Redundancy version N/A set to ‘00’Resource block N/A Set to all ‘1’s assignment

FIG. 5 illustrates an example of a process flow 500 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Insome examples, process flow 500 may be implemented in aspects ofwireless communications system 100 or 200. Process flow 500 may includeUE 115-b and base station 105-b, which may be respective examples of aUE 115 and a base station 105 as described herein. Process flow 500 mayimplement techniques for rate matching and SPS configuration inaccordance with aspects of the present disclosure.

At 505, UE 115-b and base station 105-b may establish communications. Insome cases, during connection establishment (e.g., RRC connectionestablishment or RRC connection reconfiguration), base station 105-b mayconfigure UE 115-b with a six-bit MCS table that may indicate an MCSindependently of a highest MCS of a configured CQI table.

At 510, the UE 115-b may optionally transmit a capability informationthat may indicate whether the UE 115-b has capability for highermodulation orders such as 256QAM or 1024QAM. In some cases, the UE 115-bmay transmit the capability information based on current conditions atthe UE 115-b. For example, if the UE 115-b has a relatively low batterylevel, or is at or near a high thermal limit, an indication that the UE115-b is only capable of 64QAM (or lower) modulation orders may betransmitted.

At 515, the base station 105-b may configure CQI, MCS, and SPSparameters, which may be transmitted to the UE 115-b at 520. In somecases, the CQI parameters may configure a CQI table at the UE 115-b. Inaccordance with techniques as discussed above, the MCS configuration mayindicate whether an MCS that exceeds a highest modulation order of theCQI table may be transmitted by the base station 105-a. In cases wherethe UE 115-b has provided capability information, the configurationinformation may indicate whether higher order modulation (e.g., 256QAMor 1024AM) will be used.

At 525, the UE 115-b may optionally set a RF front end power based onthe configuration information provided by the base station 105-b. Incases where only relatively low modulation orders may be used fortransmissions to the UE 115-b, the RF front end power may be set at alow fidelity mode that consumes relatively low power, and in cases wherehigher modulation orders may be used, the RF front end power may be setat a high fidelity mode that consumes relatively more power.

At 530, the base station 105-b may allocate wireless resources to the UE115-b. The base station 105-b may allocate a certain amount of wirelessresources for a downlink transmission, and may also select an MCS forthe downlink transmission. The base station 105-b may format downlinkcontrol information that indicates the allocated resources and the MCS,and may transmit the control information to the UE 115-b at 535.

At 540, the UE 115-b may determine one or more rate-matching parametersfor the downlink transmission. The UE 115-b may determine such ratematching parameters in accordance with one or more of the techniques asdiscussed above. For example, in some cases the modulation orderindicated in the control information may exceed the highest modulationorder that is associated with the configured CQI table, and the UE 115-bmay determine rate matching based on the higher modulation order. Inother cases, the base station 105-b may schedule the downlinktransmission such that the modulation order does not exceed the maximummodulation order of the configured CQI table.

At 545, the UE 115-b may optionally determine SPS activation ordeactivation. In some cases, the activation or deactivation may bedetermined based at least in part on a predetermined set of fields inthe control information having predetermined values, such as illustratedin Table 1 and Table 2.

At 550, the base station 105-b may transmit and the UE 115-b may receivedownlink transmission(s), such as PDSCH transmissions. The UE 115-b maybuffer received signals of the downlink transmission(s) in a soft bufferin accordance with the determined rate matching parameter. The UE 115-bmay then attempt to decode the buffered signals and thus decode thedownlink transmission(s). In cases, where decoding is not successful, anegative acknowledgment may be transmitted to the base station 105-bfollowed by a retransmission, and received retransmission signals may beadded to the soft buffer for further attempted decoding.

FIG. 6 shows a block diagram 600 of a device 605 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Thedevice 605 may be an example of aspects of a UE 115 as described herein.The device 605 may include a receiver 610, a communications manager 615,and a transmitter 620. Device 605 may also include one or moreprocessors, memory coupled with the one or more processors, andinstructions stored in the memory that are executable by the one or moreprocessors to enable the one or more processors to perform the ratematching and semi persistent scheduling configuration features discussedherein. Each of these components may be in communication with oneanother (e.g., via one or more buses).

The receiver 610 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to ratematching and semi persistent scheduling configuration in wirelesscommunications, etc.). Information may be passed on to other componentsof the device 605. The receiver 610 may be an example of aspects of thetransceiver 920 described with reference to FIG. 9. The receiver 610 mayutilize a single antenna or a set of antennas.

The communications manager 615 may identify a channel quality indication(CQI) table that provides one or more parameters associated with one ormore modulation orders for transmissions between the UE and a basestation, receive control information for a downlink transmission, thecontrol information including a first index value for a first entry inan MCS table, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table, and determine a rate matching parameter for the downlinktransmission based on at least one of the first modulation order or theCQI table. The communications manager 615 may also receive, from a basestation, a SPS configuration, decode control information from the basestation based on the SPS configuration, where the control informationincludes an MCS field that is decoded according to a firstinterpretation when the control information is for SPS communicationsand according to a second interpretation when the control information isfor non-SPS communications, and where the MCS field according to thesecond interpretation is capable of signaling a modulation order thatexceeds 256QAM, and determine whether SPS communications are activatedbased on the decoding. The communications manager 615 may be an exampleof aspects of the communications manager 910 described herein.

The communications manager 615, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communications manager 615, or itssub-components may be executed by a general-purpose processor, a DSP, anapplication-specific integrated circuit (ASIC), a FPGA or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described in the present disclosure.

The communications manager 615, or its sub-components, may be physicallylocated at various positions, including being distributed such thatportions of functions are implemented at different physical locations byone or more physical components. In some examples, the communicationsmanager 615, or its sub-components, may be a separate and distinctcomponent in accordance with various aspects of the present disclosure.In some examples, the communications manager 615, or its sub-components,may be combined with one or more other hardware components, includingbut not limited to an input/output (I/O) component, a transceiver, anetwork server, another computing device, one or more other componentsdescribed in the present disclosure, or a combination thereof inaccordance with various aspects of the present disclosure.

The transmitter 620 may transmit signals generated by other componentsof the device 605. In some examples, the transmitter 620 may becollocated with a receiver 610 in a transceiver module. For example, thetransmitter 620 may be an example of aspects of the transceiver 920described with reference to FIG. 9. The transmitter 620 may utilize asingle antenna or a set of antennas.

FIG. 7 shows a block diagram 700 of a device 705 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Thedevice 705 may be an example of aspects of a device 605 or a UE 115 asdescribed herein. The device 705 may include a receiver 710, acommunications manager 715, and a transmitter 745. The device 705 mayalso include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

The receiver 710 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to ratematching and semi persistent scheduling configuration in wirelesscommunications, etc.). Information may be passed on to other componentsof the device 705. The receiver 710 may be an example of aspects of thetransceiver 920 described with reference to FIG. 9. The receiver 710 mayutilize a single antenna or a set of antennas.

The communications manager 715 may be an example of aspects of thecommunications manager 615 as described herein. The communicationsmanager 715 may include a CQI component 720, an MCS component 725, arate matching component 730, a configuration manager 735, and a SPScomponent 740. The communications manager 715 may be an example ofaspects of the communications manager 910 described herein.

The CQI component 720 may identify a CQI table that provides one or moreparameters associated with one or more modulation orders fortransmissions between the UE and a base station.

The MCS component 725 may receive, from the base station, controlinformation for a downlink transmission, the control informationincluding a first index value for a first entry in an MCS table, wherethe first entry in the MCS table indicates a first modulation orderindependently of the one or more modulation orders of the CQI table.

The rate matching component 730 may determine a rate matching parameterfor the downlink transmission based on at least one of the firstmodulation order or the CQI table.

The configuration manager 735 may receive, from a base station, a SPSconfiguration, may decode control information from the base stationbased on the SPS configuration, and may determine whether SPScommunications are activated based on the decoding. In some cases, thecontrol information includes an MCS field that is decoded according to afirst interpretation when the control information is for SPScommunications and according to a second interpretation when the controlinformation is for non-SPS communications, and where the MCS fieldaccording to the second interpretation is capable of signaling amodulation order that exceeds 256QAM.

The transmitter 745 may transmit signals generated by other componentsof the device 705. In some examples, the transmitter 745 may becollocated with a receiver 710 in a transceiver module. For example, thetransmitter 745 may be an example of aspects of the transceiver 920described with reference to FIG. 9. The transmitter 745 may utilize asingle antenna or a set of antennas.

FIG. 8 shows a block diagram 800 of a communications manager 805 thatsupports rate matching and semi persistent scheduling configuration inwireless communications in accordance with aspects of the presentdisclosure. The communications manager 805 may be an example of aspectsof a communications manager 615, a communications manager 715, or acommunications manager 910 described herein. The communications manager805 may include a CQI component 810, an MCS component 815, a ratematching component 820, a RF power component 825, an RRC component 830,a transport block size component 835, a capability indication component840, a configuration manager 845, and a SPS component 850. Each of thesemodules may communicate, directly or indirectly, with one another (e.g.,via one or more buses).

The CQI component 810 may identify a CQI table that provides one or moreparameters associated with one or more modulation orders fortransmissions between the UE and a base station.

The MCS component 815 may receive, from the base station, controlinformation for a downlink transmission, the control informationincluding a first index value for a first entry in an MCS table, wherethe first entry in the MCS table indicates a first modulation orderindependently of the one or more modulation orders of the CQI table. Insome examples, the MCS component 815 may discard the control informationwhen the first modulation order exceeds a maximum modulation order ofthe one or more modulation orders of the CQI table. In other examples,the MCS component 815 may determine that the first modulation orderexceeds a maximum modulation order of the one or more modulation ordersof the CQI table, and may determine the rate matching parameter based ona highest entry in the MCS table that has a modulation order that issupported by the UE. In some cases, the rate matching parameter is basedon a highest supported modulation order supported by the UE for a radiofrequency band or band combination used for the downlink transmission.

In some examples, the MCS component 815 may receive, from the basestation, second control information for a second downlink transmission,the second control information including a second index value for asecond entry in the MCS table. In some examples, the MCS component 815may receive the second downlink transmission based on the firstmodulation order and the determined rate matching parameter.

In some examples, the base station may be provided with a capabilityindication that indicates that a higher modulation order may betransmitted, and the MCS component 815 may receive, responsive to thecapability indication, a modulation order indication that indicates thatthe base station will transmit one or more downlink transmissions havinga modulation order that exceeds the maximum modulation order indicatedby the CQI table.

In some examples, the MCS component 815 may process the controlinformation based on the modulation order indication. For example, ifthe CQI table is 256QAM and the UE is not configured to receivetransmissions with a modulation order that exceeds the highestmodulation order to the CQI table, the UE will discard controlinformation with entries for 1024QAM.

The rate matching component 820 may determine a rate matching parameterfor the downlink transmission based on at least one of the firstmodulation order or the CQI table. In some examples, the rate matchingcomponent 820 may receive the first downlink transmission based on thedetermined rate matching parameter and the first modulation order.

The configuration manager 845 may receive, from a base station, one ormore configuration parameters, such as a CQI table configuration, a SPSconfiguration, or combinations thereof.

The SPS component 850 may decode control information from the basestation based on the SPS configuration, where the control informationincludes an MCS field that is decoded according to a firstinterpretation when the control information is for SPS communicationsand according to a second interpretation when the control information isfor non-SPS communications, and where the MCS field according to thesecond interpretation is capable of signaling a modulation order thatexceeds 256QAM. In some examples, the SPS component 850 may determinewhether SPS communications are activated based on the decoding. In someexamples, the MCS field is a six-bit MCS field, and a subset of bits ofthe six-bit MCS field are used for the first interpretation. In someexamples, retransmissions of information in the MCS field are disallowedfor the first interpretation.

In some examples, the SPS component 850 may determine that one or morefields in the control information are set to predetermined values thatindicate that SPS communications are activated, the one or more fieldsincluding the MCS field in which two most significant bits set to zeroindicates SPS communications are activated. In some examples, secondcontrol information from the base station may be decoded that indicatesthat SPS communications are deactivated, where the MCS field of thesecond control information includes a six-bit field in which each bit isset to one, and the SPS component 850 may discontinue the SPScommunications. In some cases, the MCS field for the firstinterpretation is capable of indicating a first subset of entries of anMCS table, and the MCS field for the second interpretation is capable ofindicating the first subset of entries of the MCS table and a secondsubset of entries of the MCS table that is different than the firstsubset of entries. In some cases, the second subset of entries includeone or more entries of the MCS table that indicate scaling parameters,one or more entries indicating a modulation order that exceeds a 64 QAMmodulation order, one or more entries for retransmissions of MCS, or anycombinations thereof.

The RF power component 825 may set a power of receive circuitry based onthe maximum modulation order of the one or more modulation orders of theCQI table. In some examples, the RF power component 825 may select anoperating power for one or more receive components of the UE based onthe modulation order indication.

The RRC component 830 may receive RRC signaling that includes a signaledmodulation order that is different than a modulation order indicated inthe first entry in the MCS table.

The transport block size component 835 may determine a first transportblock size for the downlink transmission based on the first modulationorder. In some examples, the transport block size component 835 maycompare the first transport block size to a maximum transport block sizethat is identified based on a maximum modulation order of the one ormore modulation orders of the CQI table. In some examples, the transportblock size component 835 may receive the downlink transmission when thefirst transport block size is less than or equal to the maximumtransport block size. In some examples, the transport block sizecomponent 835 may discard the control information when the firsttransport block size exceeds the maximum transport block size.

The capability indication component 840 may transmit, to the basestation, a capability indication that indicates the UE is capable ofoperating at a modulation order that exceeds the maximum modulationorder indicated by the CQI table.

FIG. 9 shows a diagram of a system 900 including a device 905 thatsupports rate matching and semi persistent scheduling configuration inwireless communications in accordance with aspects of the presentdisclosure. The device 905 may be an example of or include thecomponents of device 605, device 705, or a UE 115 as described herein.The device 905 may include components for bi-directional voice and datacommunications including components for transmitting and receivingcommunications, including a communications manager 910, an I/Ocontroller 915, a transceiver 920, an antenna 925, memory 930, and aprocessor 940. These components may be in electronic communication viaone or more buses (e.g., bus 945).

The communications manager 910 may identify a CQI table that providesone or more parameters associated with one or more modulation orders fortransmissions between the UE and a base station, receive, from the basestation, control information for a downlink transmission, the controlinformation including a first index value for a first entry in an MCStable, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table, and determine a rate matching parameter for the downlinktransmission based on at least one of the first modulation order or theCQI table. The communications manager 910 may also receive, from a basestation, a SPS configuration, decode control information from the basestation based on the SPS configuration, where the control informationincludes an MCS field that is decoded according to a firstinterpretation when the control information is for SPS communicationsand according to a second interpretation when the control information isfor non-SPS communications, and where the MCS field according to thesecond interpretation is capable of signaling a modulation order thatexceeds 256QAM, and determine whether SPS communications are activatedbased on the decoding.

The I/O controller 915 may manage input and output signals for thedevice 905. The I/O controller 915 may also manage peripherals notintegrated into the device 905. In some cases, the I/O controller 915may represent a physical connection or port to an external peripheral.In some cases, the I/O controller 915 may utilize an operating systemsuch as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, oranother known operating system. In other cases, the I/O controller 915may represent or interact with a modem, a keyboard, a mouse, atouchscreen, or a similar device. In some cases, the I/O controller 915may be implemented as part of a processor. In some cases, a user mayinteract with the device 905 via the I/O controller 915 or via hardwarecomponents controlled by the I/O controller 915.

The transceiver 920 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 920 may represent a wireless transceiver and may communicatebi-directionally with another wireless transceiver. The transceiver 920may also include a modem to modulate the packets and provide themodulated packets to the antennas for transmission, and to demodulatepackets received from the antennas.

In some cases, the wireless device may include a single antenna 925.However, in some cases the device may have more than one antenna 925,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 930 may include RAM and ROM. The memory 930 may storecomputer-readable, computer-executable code 935 including instructionsthat, when executed, cause the processor to perform various functionsdescribed herein. In some cases, the memory 930 may contain, among otherthings, a BIOS which may control basic hardware or software operationsuch as the interaction with peripheral components or devices.

The processor 940 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 940 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into the processor 940. The processor 940 may beconfigured to execute computer-readable instructions stored in a memory(e.g., the memory 930) to cause the device 905 to perform variousfunctions (e.g., functions or tasks supporting rate matching and semipersistent scheduling configuration in wireless communications).

The code 935 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 935 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 935 may not be directly executable by theprocessor 940 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

FIG. 10 shows a block diagram 1000 of a device 1005 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Thedevice 1005 may be an example of aspects of a base station 105 asdescribed herein. The device 1005 may include a receiver 1010, acommunications manager 1015, and a transmitter 1020. Device 1005 mayalso include one or more processors, memory coupled with the one or moreprocessors, and instructions stored in the memory that are executable bythe one or more processors to enable the one or more processors toperform the rate matching and semi persistent scheduling configurationfeatures discussed herein. Each of these components may be incommunication with one another (e.g., via one or more buses).

The receiver 1010 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to ratematching and semi persistent scheduling configuration in wirelesscommunications, etc.). Information may be passed on to other componentsof the device 1005. The receiver 1010 may be an example of aspects ofthe transceiver 1320 described with reference to FIG. 13. The receiver1010 may utilize a single antenna or a set of antennas.

The communications manager 1015 may identify a CQI table that providesone or more parameters associated with one or more modulation orders fortransmissions between the base station and a UE, transmit, to the UE,control information for a downlink transmission, the control informationincluding a first index value for a first entry in an MCS table, wherethe first entry in the MCS table indicates a first modulation orderindependently of the one or more modulation orders of the CQI table, andtransmit the downlink transmission to the UE using the first modulationorder. The communications manager 1015 may also configure a UE with aSPS configuration, determine to activate SPS communications with the UEaccording to the SPS configuration, format control information toactivate the SPS communications, where the control information includesan MCS field that is formatted according to a first interpretation whenthe control information is for SPS communications and according to asecond interpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM, and transmit the control information to the UE. Thecommunications manager 1015 may be an example of aspects of thecommunications manager 1310 described herein.

The communications manager 1015, or its sub-components, may beimplemented in hardware, code (e.g., software or firmware) executed by aprocessor, or any combination thereof. If implemented in code executedby a processor, the functions of the communications manager 1015, or itssub-components may be executed by a general-purpose processor, a DSP, anapplication-specific integrated circuit (ASIC), a FPGA or otherprogrammable logic device, discrete gate or transistor logic, discretehardware components, or any combination thereof designed to perform thefunctions described in the present disclosure.

The communications manager 1015, or its sub-components, may bephysically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations by one or more physical components. In some examples, thecommunications manager 1015, or its sub-components, may be a separateand distinct component in accordance with various aspects of the presentdisclosure. In some examples, the communications manager 1015, or itssub-components, may be combined with one or more other hardwarecomponents, including but not limited to an input/output (I/O)component, a transceiver, a network server, another computing device,one or more other components described in the present disclosure, or acombination thereof in accordance with various aspects of the presentdisclosure.

The transmitter 1020 may transmit signals generated by other componentsof the device 1005. In some examples, the transmitter 1020 may becollocated with a receiver 1010 in a transceiver module. For example,the transmitter 1020 may be an example of aspects of the transceiver1320 described with reference to FIG. 13. The transmitter 1020 mayutilize a single antenna or a set of antennas.

FIG. 11 shows a block diagram 1100 of a device 1105 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Thedevice 1105 may be an example of aspects of a device 1005 or a basestation 105 as described herein. The device 1105 may include a receiver1110, a communications manager 1115, and a transmitter 1145. The device1105 may also include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

The receiver 1110 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to ratematching and semi persistent scheduling configuration in wirelesscommunications, etc.). Information may be passed on to other componentsof the device 1105. The receiver 1110 may be an example of aspects ofthe transceiver 1320 described with reference to FIG. 13. The receiver1110 may utilize a single antenna or a set of antennas.

The communications manager 1115 may be an example of aspects of thecommunications manager 1015 as described herein. The communicationsmanager 1115 may include a CQI component 1120, an MCS component 1125, aconfiguration manager 1135, and a SPS component 1140. The communicationsmanager 1115 may be an example of aspects of the communications manager1310 described herein.

The CQI component 1120 may identify a CQI table that provides one ormore parameters associated with one or more modulation orders fortransmissions between the base station and a UE.

The MCS component 1125 may transmit, to the UE, control information fora downlink transmission, the control information including a first indexvalue for a first entry in an MCS table, where the first entry in theMCS table indicates a first modulation order independently of the one ormore modulation orders of the CQI table.

The configuration manager 1135 may configure a UE with a SPSconfiguration.

The SPS component 1140 may determine to activate SPS communications withthe UE according to the SPS configuration and format control informationto activate the SPS communications, where the control informationincludes a modulation and coding scheme (MCS) field that is formattedaccording to a first interpretation when the control information is forSPS communications and according to a second interpretation when thecontrol information is for non-SPS communications, and where the MCSfield according to the second interpretation is capable of signaling amodulation order that exceeds 256QAM.

The transmitter 1145 may transmit the control information to the UE. Thetransmitter 1145 may also transmit signals generated by other componentsof the device 1105. In some examples, the transmitter 1145 may becollocated with a receiver 1110 in a transceiver module. For example,the transmitter 1145 may be an example of aspects of the transceiver1320 described with reference to FIG. 13. The transmitter 1145 mayutilize a single antenna or a set of antennas.

FIG. 12 shows a block diagram 1200 of a communications manager 1205 thatsupports rate matching and semi persistent scheduling configuration inwireless communications in accordance with aspects of the presentdisclosure. The communications manager 1205 may be an example of aspectsof a communications manager 1015, a communications manager 1115, or acommunications manager 1310 described herein. The communications manager1205 may include a CQI component 1210, an MCS component 1215, an RRCcomponent 1225, a transport block size component 1230, a capabilityindication component 1235, a configuration manager 1240, and a SPScomponent 1245. Each of these modules may communicate, directly orindirectly, with one another (e.g., via one or more buses).

The CQI component 1210 may identify a CQI table that provides one ormore parameters associated with one or more modulation orders fortransmissions between the base station and a UE.

The MCS component 1215 may transmit, to the UE, control information fora downlink transmission, the control information including a first indexvalue for a first entry in an MCS table, where the first entry in theMCS table indicates a first modulation order independently of the one ormore modulation orders of the CQI table. In some examples, the MCScomponent 1215 may determine a highest modulation order supported by theUE for a radio frequency band or band combination to be used for thedownlink transmission. In some examples, the MCS component 1215 mayselect a first modulation order as the highest modulation order, wherethe first modulation order corresponds to or exceeds a maximummodulation order of the one or more modulation orders of the CQI table.In some examples, the MCS component 1215 may transmit the downlinktransmission using the highest modulation order supported by the UE.

In some examples, the MCS component 1215 may transmit, to the UE, secondcontrol information for a second downlink transmission, the secondcontrol information including a second index value for a second entry inthe MCS table. In some examples, the MCS component 1215 may transmit thesecond downlink transmission using the first modulation order. In somecases, the first index value is a six-bit index value that identifiesthe first entry from 64 available entries of the MCS table. In somecases, the first modulation order is selected to be at or below amaximum modulation order of the one or more modulation orders of the CQItable.

The configuration manager 1240 may configure a UE with a SPSconfiguration.

The SPS component 1245 may determine to activate SPS communications withthe UE according to the SPS configuration. In some examples, the SPScomponent 1245 may format control information to activate the SPScommunications, where the control information includes an MCS field thatis formatted according to a first interpretation when the controlinformation is for SPS communications and according to a secondinterpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM. In some examples, the SPS component 1245 may where the MCS fieldis a six-bit MCS field, and a subset of bits of the six-bit MCS fieldare used for the first interpretation. In some examples, the SPScomponent 1245 may set two most significant bits of the MCS field tozero for the first interpretation. In some examples, retransmissions ofinformation in the MCS field are disallowed for the firstinterpretation. In some examples, the SPS component 1245 may set one ormore fields in the control information to predetermined values thatindicate that SPS is activated, the one or more fields including the MCSfield in which two most significant bits are set to zero to indicate SPScommunications are activated. In some examples, the SPS component 1245may communicate with the UE using SPS transmissions.

In some examples, the SPS component 1245 may determine to deactivate theSPS communications. In some examples, the SPS component 1245 may formatsecond control information that indicates that SPS communications aredeactivated, where the MCS field of the second control informationincludes a six-bit field in which each bit is set to one. In someexamples, the SPS component 1245 may transmit the second controlinformation to the UE, and may discontinue the SPS communications.

In some cases, the MCS field for the first interpretation is capable ofindicating a first subset of entries of an MCS table, and the MCS fieldfor the second interpretation is capable of indicating the first subsetof entries of the MCS table and a second subset of entries of the MCStable that is different than the first subset of entries. In some cases,the second subset of entries include one or more entries of the MCStable that indicate scaling parameters, one or more entries indicating amodulation order that exceeds a 64 QAM modulation order, one or moreentries for retransmissions of MCS, or any combinations thereof.

The RRC component 1225 may transmit RRC signaling that includes asignaled modulation order that is different than a modulation orderindicated in the first entry in the MCS table.

The transport block size component 1230 may determine a first transportblock size for the downlink transmission that is less than or equal to amaximum transport block size that is identified based on a maximummodulation order of the one or more modulation orders of the CQI table,and where the downlink transmission uses the first transport block size.

The capability indication component 1235 may receive, from the UE, acapability indication that indicates the UE is capable of operating at amodulation order that exceeds the maximum modulation order indicated bythe CQI table. In some examples, the capability indication component1235 may transmit, responsive to the capability indication, a modulationorder indication that indicates that the base station will transmit oneor more downlink transmissions having a modulation order that exceedsthe maximum modulation order indicated by the CQI table.

FIG. 13 shows a diagram of a system 1300 including a device 1305 thatsupports rate matching and semi persistent scheduling configuration inwireless communications in accordance with aspects of the presentdisclosure. The device 1305 may be an example of or include thecomponents of device 1005, device 1105, or a base station 105 asdescribed herein. The device 1305 may include components forbi-directional voice and data communications including components fortransmitting and receiving communications, including a communicationsmanager 1310, a network communications manager 1315, a transceiver 1320,an antenna 1325, memory 1330, a processor 1340, and an inter-stationcommunications manager 1345. These components may be in electroniccommunication via one or more buses (e.g., bus 1350).

The communications manager 1310 may identify a CQI table that providesone or more parameters associated with one or more modulation orders fortransmissions between the base station and a UE, transmit, to the UE,control information for a downlink transmission, the control informationincluding a first index value for a first entry in an MCS table, wherethe first entry in the MCS table indicates a first modulation orderindependently of the one or more modulation orders of the CQI table, andtransmit the downlink transmission to the UE using the first modulationorder. The communications manager 1310 may also configure a UE with aSPS configuration, determine to activate SPS communications with the UEaccording to the SPS configuration, format control information toactivate the SPS communications, where the control information includesan MCS field that is formatted according to a first interpretation whenthe control information is for SPS communications and according to asecond interpretation when the control information is for non-SPScommunications, and where the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256QAM, and transmit the control information to the UE.

The network communications manager 1315 may manage communications withthe core network (e.g., via one or more wired backhaul links). Forexample, the network communications manager 1315 may manage the transferof data communications for client devices, such as one or more UEs 115.

The transceiver 1320 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described above. For example, thetransceiver 1320 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1320 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 1325.However, in some cases the device may have more than one antenna 1325,which may be capable of concurrently transmitting or receiving multiplewireless transmissions.

The memory 1330 may include RAM, ROM, or a combination thereof. Thememory 1330 may store computer-readable code 1335 including instructionsthat, when executed by a processor (e.g., the processor 1340) cause thedevice to perform various functions described herein. In some cases, thememory 1330 may contain, among other things, a BIOS which may controlbasic hardware or software operation such as the interaction withperipheral components or devices.

The processor 1340 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, the processor 1340 may be configured to operate a memoryarray using a memory controller. In some cases, a memory controller maybe integrated into processor 1340. The processor 1340 may be configuredto execute computer-readable instructions stored in a memory (e.g., thememory 1330) to cause the device to perform various functions (e.g.,functions or tasks supporting rate matching and semi persistentscheduling configuration in wireless communications).

The inter-station communications manager 1345 may manage communicationswith other base station 105, and may include a controller or schedulerfor controlling communications with UEs 115 in cooperation with otherbase stations 105. For example, the inter-station communications manager1345 may coordinate scheduling for transmissions to UEs 115 for variousinterference mitigation techniques such as beamforming or jointtransmission. In some examples, the inter-station communications manager1345 may provide an X2 interface within an LTE/LTE-A wirelesscommunication network technology to provide communication between basestations 105.

The code 1335 may include instructions to implement aspects of thepresent disclosure, including instructions to support wirelesscommunications. The code 1335 may be stored in a non-transitorycomputer-readable medium such as system memory or other type of memory.In some cases, the code 1335 may not be directly executable by theprocessor 1340 but may cause a computer (e.g., when compiled andexecuted) to perform functions described herein.

FIG. 14 shows a flowchart illustrating a method 1400 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 1400 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1400 may be performed by a communications manager as described withreference to FIGS. 6 through 9. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 1405, the UE may identify a CQI table that provides one or moreparameters associated with one or more modulation orders fortransmissions between the UE and a base station. The operations of 1405may be performed according to the methods described herein. In someexamples, aspects of the operations of 1405 may be performed by a CQIcomponent as described with reference to FIGS. 6 through 9.

At 1410, the UE may receive, from the base station, control informationfor a downlink transmission, the control information including a firstindex value for a first entry in an MCS table, where the first entry inthe MCS table indicates a first modulation order independently of theone or more modulation orders of the CQI table. The operations of 1410may be performed according to the methods described herein. In someexamples, aspects of the operations of 1410 may be performed by an MCScomponent as described with reference to FIGS. 6 through 9. In somecases, the first index value is a six-bit index value that identifiesthe first entry from 64 available entries of the MCS table.

At 1415, the UE may determine a rate matching parameter for the downlinktransmission based on at least one of the first modulation order or theCQI table. The operations of 1415 may be performed according to themethods described herein. In some examples, aspects of the operations of1415 may be performed by a rate matching component as described withreference to FIGS. 6 through 9. In some cases, the UE may determine thatthe first modulation order exceeds a maximum modulation order of the oneor more modulation orders of the CQI table, and may determine the ratematching parameter based on a highest entry in the MCS table that has amodulation order that is supported by the UE. In some cases, the ratematching parameter is based on a highest supported modulation ordersupported by the UE for a radio frequency band or band combination usedfor the downlink transmission

FIG. 15 shows a flowchart illustrating a method 1500 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 1500 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1500 may be performed by a communications manager as described withreference to FIGS. 6 through 9. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 1505, the UE may identify a channel quality indication (CQI) tablethat provides one or more parameters associated with one or moremodulation orders for transmissions between the UE and a base station.The operations of 1505 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1505may be performed by a CQI component as described with reference to FIGS.6 through 9.

At 1510, the UE may receive, from the base station, control informationfor a downlink transmission, the control information including a firstindex value for a first entry in a modulation and coding scheme (MCS)table, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table. The operations of 1510 may be performed according to themethods described herein. In some examples, aspects of the operations of1510 may be performed by an MCS component as described with reference toFIGS. 6 through 9.

At 1515, the UE may determine a rate matching parameter for the downlinktransmission based on at least one of the first modulation order or theCQI table. The operations of 1515 may be performed according to themethods described herein. In some examples, aspects of the operations of1515 may be performed by a rate matching component as described withreference to FIGS. 6 through 9.

At 1520, the UE may discard the control information when the firstmodulation order exceeds a maximum modulation order of the one or moremodulation orders of the CQI table. The operations of 1520 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1520 may be performed by an MCS componentas described with reference to FIGS. 6 through 9.

At 1525, the UE may optionally set a power of receive circuitry based onthe maximum modulation order of the one or more modulation orders of theCQI table. The operations of 1525 may be performed according to themethods described herein. In some examples, aspects of the operations of1525 may be performed by a RF power component as described withreference to FIGS. 6 through 9.

FIG. 16 shows a flowchart illustrating a method 1600 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 1600 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1600 may be performed by a communications manager as described withreference to FIGS. 6 through 9. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 1605, the UE may identify a channel quality indication (CQI) tablethat provides one or more parameters associated with one or moremodulation orders for transmissions between the UE and a base station.The operations of 1605 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1605may be performed by a CQI component as described with reference to FIGS.6 through 9.

At 1610, the UE may receive, from the base station, control informationfor a downlink transmission, the control information including a firstindex value for a first entry in a modulation and coding scheme (MCS)table, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table. The operations of 1610 may be performed according to themethods described herein. In some examples, aspects of the operations of1610 may be performed by an MCS component as described with reference toFIGS. 6 through 9.

At 1615, the UE may determine a first transport block size for thedownlink transmission based on the first modulation order. Theoperations of 1615 may be performed according to the methods describedherein. In some examples, aspects of the operations of 1615 may beperformed by a transport block size component as described withreference to FIGS. 6 through 9.

At 1620, the UE may compare the first transport block size to a maximumtransport block size that is identified based on a maximum modulationorder of the one or more modulation orders of the CQI table. Theoperations of 1620 may be performed according to the methods describedherein. In some examples, aspects of the operations of 1620 may beperformed by a transport block size component as described withreference to FIGS. 6 through 9.

At 1625, the UE may receive the downlink transmission when the firsttransport block size is less than or equal to the maximum transportblock size. The operations of 1625 may be performed according to themethods described herein. In some examples, aspects of the operations of1625 may be performed by a transport block size component as describedwith reference to FIGS. 6 through 9.

At 1630, the UE may discard the control information when the firsttransport block size exceeds the maximum transport block size. Theoperations of 1630 may be performed according to the methods describedherein. In some examples, aspects of the operations of 1630 may beperformed by a transport block size component as described withreference to FIGS. 6 through 9.

FIG. 17 shows a flowchart illustrating a method 1700 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 1700 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1700 may be performed by a communications manager as described withreference to FIGS. 6 through 9. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 1705, the UE may identify a channel quality indication (CQI) tablethat provides one or more parameters associated with one or moremodulation orders for transmissions between the UE and a base station.The operations of 1705 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1705may be performed by a CQI component as described with reference to FIGS.6 through 9.

At 1710, the UE may receive, from the base station, control informationfor a downlink transmission, the control information including a firstindex value for a first entry in a modulation and coding scheme (MCS)table, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table. The operations of 1710 may be performed according to themethods described herein. In some examples, aspects of the operations of1710 may be performed by an MCS component as described with reference toFIGS. 6 through 9.

At 1715, the UE may determine a rate matching parameter for the downlinktransmission based on at least one of the first modulation order or theCQI table. The operations of 1715 may be performed according to themethods described herein. In some examples, aspects of the operations of1715 may be performed by a rate matching component as described withreference to FIGS. 6 through 9.

At 1720, the UE may receive the first downlink transmission based on thedetermined rate matching parameter and the first modulation order. Theoperations of 1720 may be performed according to the methods describedherein. In some examples, aspects of the operations of 1720 may beperformed by a rate matching component as described with reference toFIGS. 6 through 9.

At 1725, the UE may receive, from the base station, second controlinformation for a second downlink transmission, the second controlinformation including a second index value for a second entry in the MCStable. The operations of 1725 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1725may be performed by an MCS component as described with reference toFIGS. 6 through 9.

At 1730, the UE may receive the second downlink transmission based onthe first modulation order and the determined rate matching parameter.The operations of 1730 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1730may be performed by an MCS component as described with reference toFIGS. 6 through 9.

FIG. 18 shows a flowchart illustrating a method 1800 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 1800 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1800 may be performed by a communications manager as described withreference to FIGS. 6 through 9. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 1805, the UE may transmit, to the base station, a capabilityindication that indicates the UE is capable of operating at a modulationorder that exceeds the maximum modulation order indicated by the CQItable. The operations of 1805 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1805may be performed by a capability indication component as described withreference to FIGS. 6 through 9.

At 1810, the UE may identify a channel quality indication (CQI) tablethat provides one or more parameters associated with one or moremodulation orders for transmissions between the UE and a base station.The operations of 1810 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1810may be performed by a CQI component as described with reference to FIGS.6 through 9.

At 1815, the UE may receive, from the base station, control informationfor a downlink transmission, the control information including a firstindex value for a first entry in a modulation and coding scheme (MCS)table, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table. The operations of 1815 may be performed according to themethods described herein. In some examples, aspects of the operations of1815 may be performed by an MCS component as described with reference toFIGS. 6 through 9.

At 1820, the UE may determine a rate matching parameter for the downlinktransmission based on at least one of the first modulation order or theCQI table. The operations of 1820 may be performed according to themethods described herein. In some examples, aspects of the operations of1820 may be performed by a rate matching component as described withreference to FIGS. 6 through 9.

At 1825, the UE may receive, responsive to the capability indication, amodulation order indication that indicates that the base station willtransmit one or more downlink transmissions having a modulation orderthat exceeds the maximum modulation order indicated by the CQI table.The operations of 1825 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1825may be performed by an MCS component as described with reference toFIGS. 6 through 9.

At 1830, the UE may process the control information based on themodulation order indication. The operations of 1830 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 1830 may be performed by an MCS component as describedwith reference to FIGS. 6 through 9.

At 1835, the UE may select an operating power for one or more receivecomponents of the UE based on the modulation order indication. Theoperations of 1835 may be performed according to the methods describedherein. In some examples, aspects of the operations of 1835 may beperformed by a RF power component as described with reference to FIGS. 6through 9.

FIG. 19 shows a flowchart illustrating a method 1900 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 1900 may be implemented by a base station 105 orits components as described herein. For example, the operations ofmethod 1900 may be performed by a communications manager as describedwith reference to FIGS. 10 through 13. In some examples, a base stationmay execute a set of instructions to control the functional elements ofthe base station to perform the functions described below. Additionally,or alternatively, a base station may perform aspects of the functionsdescribed below using special-purpose hardware.

At 1905, the base station may identify a channel quality indication(CQI) table that provides one or more parameters associated with one ormore modulation orders for transmissions between the base station and aUE. The operations of 1905 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 1905may be performed by a CQI component as described with reference to FIGS.10 through 13.

At 1910, the base station may transmit, to the UE, control informationfor a downlink transmission, the control information including a firstindex value for a first entry in a modulation and coding scheme (MCS)table, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table. The operations of 1910 may be performed according to themethods described herein. In some examples, aspects of the operations of1910 may be performed by an MCS component as described with reference toFIGS. 10 through 13.

At 1915, the base station may transmit the downlink transmission to theUE using the first modulation order. The operations of 1915 may beperformed according to the methods described herein. In some examples,aspects of the operations of 1915 may be performed by a transmitter asdescribed with reference to FIGS. 10 through 13.

FIG. 20 shows a flowchart illustrating a method 2000 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 2000 may be implemented by a base station 105 orits components as described herein. For example, the operations ofmethod 2000 may be performed by a communications manager as describedwith reference to FIGS. 10 through 13. In some examples, a base stationmay execute a set of instructions to control the functional elements ofthe base station to perform the functions described below. Additionally,or alternatively, a base station may perform aspects of the functionsdescribed below using special-purpose hardware.

At 2005, the base station may identify a channel quality indication(CQI) table that provides one or more parameters associated with one ormore modulation orders for transmissions between the base station and aUE. The operations of 2005 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 2005may be performed by a CQI component as described with reference to FIGS.10 through 13.

At 2010, the base station may transmit, to the UE, control informationfor a downlink transmission, the control information including a firstindex value for a first entry in a modulation and coding scheme (MCS)table, where the first entry in the MCS table indicates a firstmodulation order independently of the one or more modulation orders ofthe CQI table. The operations of 2010 may be performed according to themethods described herein. In some examples, aspects of the operations of2010 may be performed by an MCS component as described with reference toFIGS. 10 through 13.

At 2015, the base station may determine a highest modulation ordersupported by the UE for a radio frequency band or band combination to beused for the downlink transmission. The operations of 2015 may beperformed according to the methods described herein. In some examples,aspects of the operations of 2015 may be performed by an MCS componentas described with reference to FIGS. 10 through 13.

At 2020, the base station may select the first modulation order as thehighest modulation order, where the first modulation order correspondsto or exceeds a maximum modulation order of the one or more modulationorders of the CQI table. The operations of 2020 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 2020 may be performed by an MCS component as describedwith reference to FIGS. 10 through 13.

At 2025, the base station may transmit the downlink transmission usingthe highest modulation order supported by the UE. The operations of 2025may be performed according to the methods described herein. In someexamples, aspects of the operations of 2025 may be performed by an MCScomponent as described with reference to FIGS. 10 through 13.

FIG. 21 shows a flowchart illustrating a method 2100 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 2100 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method2100 may be performed by a communications manager as described withreference to FIGS. 6 through 9. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 2105, the UE may receive, from a base station, a semi persistentscheduling (SPS) configuration. The operations of 2105 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 2105 may be performed by a configuration manager asdescribed with reference to FIGS. 6 through 9.

At 2110, the UE may decode control information from the base stationbased on the SPS configuration, where the control information includes amodulation and coding scheme (MCS) field that is decoded according to afirst interpretation when the control information is for SPScommunications and according to a second interpretation when the controlinformation is for non-SPS communications, and where the MCS fieldaccording to the second interpretation is capable of signaling amodulation order that exceeds 256QAM. The operations of 2110 may beperformed according to the methods described herein. In some examples,aspects of the operations of 2110 may be performed by a SPS component asdescribed with reference to FIGS. 6 through 9. In some cases, the MCSfield is a six-bit MCS field, and a subset of bits of the six-bit MCSfield are used for the first interpretation. In some cases, the two mostsignificant bits of the MCS field are set to zero for the firstinterpretation. In some cases, retransmissions of information in the MCSfield are disallowed for the first interpretation. In some cases, theMCS field for the first interpretation is capable of indicating a firstsubset of entries of an MCS table, and the MCS field for the secondinterpretation is capable of indicating the first subset of entries ofthe MCS table and a second subset of entries of the MCS table that isdifferent than the first subset of entries. In some examples, the secondsubset of entries include one or more entries of the MCS table thatindicate scaling parameters, one or more entries indicating a modulationorder that exceeds a 64 QAM modulation order, one or more entries forretransmissions of MCS, or any combinations thereof.

At 2115, the UE may determine whether SPS communications are activatedbased on the decoding. The operations of 2115 may be performed accordingto the methods described herein. In some examples, aspects of theoperations of 2115 may be performed by a SPS component as described withreference to FIGS. 6 through 9.

FIG. 22 shows a flowchart illustrating a method 2200 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 2200 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method2200 may be performed by a communications manager as described withreference to FIGS. 6 through 9. In some examples, a UE may execute a setof instructions to control the functional elements of the UE to performthe functions described below. Additionally, or alternatively, a UE mayperform aspects of the functions described below using special-purposehardware.

At 2205, the UE may receive, from a base station, a semi persistentscheduling (SPS) configuration. The operations of 2205 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 2205 may be performed by a configuration manager asdescribed with reference to FIGS. 6 through 9.

At 2210, the UE may decode control information from the base stationbased on the SPS configuration, where the control information includes amodulation and coding scheme (MCS) field that is decoded according to afirst interpretation when the control information is for SPScommunications and according to a second interpretation when the controlinformation is for non-SPS communications, and where the MCS fieldaccording to the second interpretation is capable of signaling amodulation order that exceeds 256QAM. The operations of 2210 may beperformed according to the methods described herein. In some examples,aspects of the operations of 2210 may be performed by a SPS component asdescribed with reference to FIGS. 6 through 9.

At 2215, the UE may determine that one or more fields in the controlinformation are set to predetermined values that indicate that SPScommunications are activated, the one or more fields including the MCSfield in which two most significant bits set to zero indicates SPScommunications are activated. The operations of 2215 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 2215 may be performed by a SPS component as describedwith reference to FIGS. 6 through 9.

At 2220, the UE may communicate with the base station using SPStransmissions. The operations of 2220 may be performed according to themethods described herein. In some examples, aspects of the operations of2220 may be performed by a SPS component as described with reference toFIGS. 6 through 9.

At 2225, the UE may decode second control information from the basestation that indicates that SPS communications are deactivated, wherethe MCS field of the second control information includes a six-bit fieldin which each bit is set to one. The operations of 2225 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 2225 may be performed by a SPS component as describedwith reference to FIGS. 6 through 9.

At 2230, the UE may discontinue the SPS communications. The operationsof 2230 may be performed according to the methods described herein. Insome examples, aspects of the operations of 2230 may be performed by aSPS component as described with reference to FIGS. 6 through 9.

FIG. 23 shows a flowchart illustrating a method 2300 that supports ratematching and semi persistent scheduling configuration in wirelesscommunications in accordance with aspects of the present disclosure. Theoperations of method 2300 may be implemented by a base station 105 orits components as described herein. For example, the operations ofmethod 2300 may be performed by a communications manager as describedwith reference to FIGS. 10 through 13. In some examples, a base stationmay execute a set of instructions to control the functional elements ofthe base station to perform the functions described below. Additionally,or alternatively, a base station may perform aspects of the functionsdescribed below using special-purpose hardware.

At 2305, the base station may configure a UE with a semi persistentscheduling (SPS) configuration. The operations of 2305 may be performedaccording to the methods described herein. In some examples, aspects ofthe operations of 2305 may be performed by a configuration manager asdescribed with reference to FIGS. 10 through 13.

At 2310, the base station may determine to activate SPS communicationswith the UE according to the SPS configuration. The operations of 2310may be performed according to the methods described herein. In someexamples, aspects of the operations of 2310 may be performed by a SPScomponent as described with reference to FIGS. 10 through 13.

At 2315, the base station may format control information to activate theSPS communications, where the control information includes a modulationand coding scheme (MCS) field that is formatted according to a firstinterpretation when the control information is for SPS communicationsand according to a second interpretation when the control information isfor non-SPS communications, and where the MCS field according to thesecond interpretation is capable of signaling a modulation order thatexceeds 256QAM. The operations of 2315 may be performed according to themethods described herein. In some examples, aspects of the operations of2315 may be performed by a SPS component as described with reference toFIGS. 10 through 13.

At 2320, the base station may transmit the control information to theUE. The operations of 2320 may be performed according to the methodsdescribed herein. In some examples, aspects of the operations of 2320may be performed by a transmitter as described with reference to FIGS.10 through 13.

It should be noted that the methods described above describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

Techniques described herein may be used for various wirelesscommunications systems such as code division multiple access (CDMA),time division multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and other systems.A CDMA system may implement a radio technology such as CDMA2000,Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000,IS-95, and IS-856 standards. IS-2000 Releases may be commonly referredto as CDMA2000 1×, 1×, etc. IS-856 (TIA-856) is commonly referred to asCDMA2000 1×EV-DO, High Rate Packet Data (HRPD), etc. UTRA includesWideband CDMA (WCDMA) and other variants of CDMA. A TDMA system mayimplement a radio technology such as Global System for MobileCommunications (GSM).

An OFDMA system may implement a radio technology such as Ultra MobileBroadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical andElectronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal MobileTelecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are releasesof UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR,and GSM are described in documents from the organization named “3rdGeneration Partnership Project” (3GPP). CDMA2000 and UMB are describedin documents from an organization named “3rd Generation PartnershipProject 2” (3GPP2). The techniques described herein may be used for thesystems and radio technologies mentioned above as well as other systemsand radio technologies. While aspects of an LTE, LTE-A, LTE-A Pro, or NRsystem may be described for purposes of example, and LTE, LTE-A, LTE-APro, or NR terminology may be used in much of the description, thetechniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro,or NR applications.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEs115 with service subscriptions with the network provider. A small cellmay be associated with a lower-powered base station 105, as comparedwith a macro cell, and a small cell may operate in the same or different(e.g., licensed, unlicensed, etc.) frequency bands as macro cells. Smallcells may include pico cells, femto cells, and micro cells according tovarious examples. A pico cell, for example, may cover a small geographicarea and may allow unrestricted access by UEs 115 with servicesubscriptions with the network provider. A femto cell may also cover asmall geographic area (e.g., a home) and may provide restricted accessby UEs 115 having an association with the femto cell (e.g., UEs 115 in aclosed subscriber group (CSG), UEs 115 for users in the home, and thelike). An eNB for a macro cell may be referred to as a macro eNB. An eNBfor a small cell may be referred to as a small cell eNB, a pico eNB, afemto eNB, or a home eNB. An eNB may support one or multiple (e.g., two,three, four, and the like) cells, and may also support communicationsusing one or multiple component carriers.

The wireless communications system 100 or systems described herein maysupport synchronous or asynchronous operation. For synchronousoperation, the base stations 105 may have similar frame timing, andtransmissions from different base stations 105 may be approximatelyaligned in time. For asynchronous operation, the base stations 105 mayhave different frame timing, and transmissions from different basestations 105 may not be aligned in time. The techniques described hereinmay be used for either synchronous or asynchronous operations.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, optical fields or particles, or any combinationthereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a digital signal processor (DSP), anapplication-specific integrated circuit (ASIC), a field-programmablegate array (FPGA) or other programmable logic device (PLD), discretegate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general-purpose processor may be a microprocessor, but in thealternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices (e.g., a combinationof a DSP and a microprocessor, multiple microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described above can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations.

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that can beaccessed by a general purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media mayinclude random-access memory (RAM), read-only memory (ROM), electricallyerasable programmable read only memory (EEPROM), flash memory, compactdisk (CD) ROM or other optical disk storage, magnetic disk storage orother magnetic storage devices, or any other non-transitory medium thatcan be used to carry or store desired program code means in the form ofinstructions or data structures and that can be accessed by ageneral-purpose or special-purpose computer, or a general-purpose orspecial-purpose processor. Also, any connection is properly termed acomputer-readable medium. For example, if the software is transmittedfrom a website, server, or other remote source using a coaxial cable,fiber optic cable, twisted pair, digital subscriber line (DSL), orwireless technologies such as infrared, radio, and microwave, then thecoaxial cable, fiber optic cable, twisted pair, DSL, or wirelesstechnologies such as infrared, radio, and microwave are included in thedefinition of medium. Disk and disc, as used herein, include CD, laserdisc, optical disc, digital versatile disc (DVD), floppy disk andBlu-ray disc where disks usually reproduce data magnetically, whilediscs reproduce data optically with lasers. Combinations of the aboveare also included within the scope of computer-readable media.

As used herein, including in the claims, “or” as used in a list of items(e.g., a list of items prefaced by a phrase such as “at least one of” or“one or more of”) indicates an inclusive list such that, for example, alist of at least one of A, B, or C means A or B or C or AB or AC or BCor ABC (i.e., A and B and C). Also, as used herein, the phrase “basedon” shall not be construed as a reference to a closed set of conditions.For example, an exemplary step that is described as “based on conditionA” may be based on both a condition A and a condition B withoutdeparting from the scope of the present disclosure. In other words, asused herein, the phrase “based on” shall be construed in the same manneras the phrase “based at least in part on.”

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label, or othersubsequent reference label.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, well-known structures and devices are shownin block diagram form in order to avoid obscuring the concepts of thedescribed examples.

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other variations withoutdeparting from the scope of the disclosure. Thus, the disclosure is notlimited to the examples and designs described herein, but is to beaccorded the broadest scope consistent with the principles and novelfeatures disclosed herein.

What is claimed is:
 1. A method for wireless communication at a userequipment (UE), comprising: receiving, from a base station, a semipersistent scheduling (SPS) configuration; decoding control informationfrom the base station based at least in part on the SPS configuration,wherein the control information includes a modulation and coding scheme(MCS) field that is decoded according to a first interpretation when thecontrol information is for SPS communications and according to a secondinterpretation when the control information is for non-SPScommunications, and wherein the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256 quadrature amplitude modulation; and determining whether SPScommunications are activated based at least in part on the decoding. 2.The method of claim 1, wherein the MCS field is a six-bit MCS field, anda subset of bits of the six-bit MCS field are used for the firstinterpretation.
 3. The method of claim 2, wherein two most significantbits of the MCS field are set to zero for the first interpretation. 4.The method of claim 2, wherein retransmissions of information in the MCSfield are disallowed for the first interpretation.
 5. The method ofclaim 1, wherein the MCS field for the first interpretation is capableof indicating a first subset of entries of an MCS table, and the MCSfield for the second interpretation is capable of indicating the firstsubset of entries of the MCS table and a second subset of entries of theMCS table that is different than the first subset of entries.
 6. Themethod of claim 5, wherein the second subset of entries include one ormore entries of the MCS table that indicate scaling parameters, one ormore entries indicating a modulation order that exceeds a 64 quadratureamplitude modulation order, one or more entries for retransmissions ofMCS, or any combinations thereof.
 7. The method of claim 1, wherein thedetermining whether SPS communications are activated comprises:determining that one or more fields in the control information are setto predetermined values that indicate that SPS communications areactivated, the one or more fields including the MCS field in which twomost significant bits set to zero indicates SPS communications areactivated.
 8. The method of claim 1, wherein the control information isfirst control information that activates SPS communications, and whereinthe method further comprises: communicating with the base station usingSPS transmissions; decoding second control information from the basestation that indicates that SPS communications are deactivated, whereinthe MCS field of the second control information comprises a six-bitfield in which each bit is set to one; and discontinuing the SPScommunications.
 9. A method for wireless communication at a basestation, comprising: configuring a user equipment (UE) with a semipersistent scheduling (SPS) configuration; determining to activate SPScommunications with the UE according to the SPS configuration;formatting control information to activate the SPS communications,wherein the control information includes a modulation and coding scheme(MCS) field that is formatted according to a first interpretation whenthe control information is for SPS communications and according to asecond interpretation when the control information is for non-SPScommunications, and wherein the MCS field according to the secondinterpretation is capable of signaling a modulation order that exceeds256 quadrature amplitude modulation; and transmitting the controlinformation to the UE.
 10. The method of claim 9, wherein the MCS fieldis a six-bit MCS field, and a subset of bits of the six-bit MCS fieldare used for the first interpretation.
 11. The method of claim 10,wherein the formatting further comprises: setting two most significantbits of the MCS field to zero for the first interpretation.
 12. Themethod of claim 10, wherein retransmissions of information in the MCSfield are disallowed for the first interpretation.
 13. The method ofclaim 9, wherein the MCS field for the first interpretation is capableof indicating a first subset of entries of an MCS table, and the MCSfield for the second interpretation is capable of indicating the firstsubset of entries of the MCS table and a second subset of entries of theMCS table that is different than the first subset of entries.
 14. Themethod of claim 13, wherein the second subset of entries include one ormore entries of the MCS table that indicate scaling parameters, one ormore entries indicating a modulation order that exceeds a 64 quadratureamplitude modulation order, one or more entries for retransmissions ofMCS, or any combinations thereof.
 15. The method of claim 9, wherein theformatting control information to activate the SPS communicationscomprises: setting one or more fields in the control information topredetermined values that indicate that SPS is activated, the one ormore fields including the MCS field in which two most significant bitsare set to zero to indicate SPS communications are activated.
 16. Themethod of claim 9, further comprising: communicating with the UE usingSPS transmissions; determining to deactivate the SPS communications;formatting second control information that indicates that SPScommunications are deactivated, wherein the MCS field of the secondcontrol information comprises a six-bit field in which each bit is setto one; transmitting the second control information to the UE; anddiscontinuing the SPS communications.
 17. An apparatus for wirelesscommunication, comprising: a processor, memory coupled with theprocessor; and instructions stored in the memory and operable, whenexecuted by the processor to cause the apparatus to: receive, from abase station, a semi persistent scheduling (SPS) configuration; decodecontrol information from the base station based at least in part on theSPS configuration, wherein the control information includes a modulationand coding scheme (MCS) field that is decoded according to a firstinterpretation when the control information is for SPS communicationsand according to a second interpretation when the control information isfor non-SPS communications, and wherein the MCS field according to thesecond interpretation is capable of signaling a modulation order thatexceeds 256 quadrature amplitude modulation; and determine whether SPScommunications are activated based at least in part on the decoding. 18.The apparatus of claim 17, further comprising: at least one antenna forreceiving the SPS configuration, and wherein the MCS field is a six-bitMCS field, and a subset of bits of the six-bit MCS field are used forthe first interpretation.
 19. The apparatus of claim 17, wherein theinstructions to determine whether SPS communications are activated arefurther executable by the processor to cause the apparatus to: determinethat one or more fields in the control information are set topredetermined values that indicate that SPS communications areactivated, the one or more fields including the MCS field in which twomost significant bits set to zero indicates SPS communications areactivated.
 20. The apparatus of claim 17, wherein the controlinformation is first control information that activates SPScommunications, and wherein the instructions are further executable bythe processor to cause to the apparatus to the method further comprises:communicate with the base station using SPS transmissions; decode secondcontrol information from the base station that indicates that SPScommunications are deactivated, wherein the MCS field of the secondcontrol information comprises a six-bit field in which each bit is setto one; and discontinue the SPS communications.